: Unusually small files for a video (e.g., under 1MB) are a red flag for potential malware.

.mp4 (MPEG-4 Part 14). This is a standard digital multimedia container format most commonly used to store video and audio.

To provide a more detailed report, you can check the file's "Properties" (Windows) or "Get Info" (Mac) to see: : (e.g., 1920x1080) Duration : How long the video is.