Based on common naming conventions in system utilities, hydra5-x64.dll likely fulfills one of the following roles:
A DLL file is a library of code that multiple programs can use simultaneously. The name hydra5-x64.dll provides significant clues about its function: hydra5-x64.dll
If you have determined the file is malicious or belongs to an uninstalled program you no longer use, removal requires care. Deleting a DLL manually can break other applications. Based on common naming conventions in system utilities,
Safe removal process: