11. A system for identifying potentially malicious singleton files, the system comprising: at least one physical processor; and a system memory having stored therein one or more computer-executable instructions that, when executed by the at least one physical processor, cause the system to perform the following: identify a set of benign singleton files and a set of malicious singleton files; obtain, for each singleton file in the sets of benign and malicious singleton files, file identification information that identifies the singleton file; use the file identification information of the singleton files from the sets of benign and malicious singleton files to train a classifier to classify unknown singleton files; detect an unclassified singleton file; analyze, with the trained classifier, information that identifies the unclassified singleton file; determine, based on the analysis of the information that identifies the unclassified singleton file, that the unclassified singleton file is suspicious; and trigger a security action in response to determining that the unclassified singleton file is suspicious.
11. A system for identifying potentially malicious singleton files, the system comprising: at least one physical processor; and a system memory having stored therein one or more computer-executable instructions that, when executed by the at least one physical processor, cause the system to perform the following: identify a set of benign singleton files and a set of malicious singleton files; obtain, for each singleton file in the sets of benign and malicious singleton files, file identification information that identifies the singleton file; use the file identification information of the singleton files from the sets of benign and malicious singleton files to train a classifier to classify unknown singleton files; detect an unclassified singleton file; analyze, with the trained classifier, information that identifies the unclassified singleton file; determine, based on the analysis of the information that identifies the unclassified singleton file, that the unclassified singleton file is suspicious; and trigger a security action in response to determining that the unclassified singleton file is suspicious. 16. The system of claim 11 , wherein the system uses the file identification information to train the classifier by: deriving features from the file identification information; using a machine learning model to classify the features derived from the file identification information.