Do not just Google "Jenny Mod download" and click the first link. Here are safe indicators of a verified source:
There are several benefits to using TLauncher to download the Jenny Mod:
Leo froze. How did it know his name? He reached for the power button, but the monitor stayed lit. His mouse cursor began moving on its own, clicking through his personal files, opening his webcam feed. On the screen, he saw himself—pale and terrified—reflected back in the purple grass of the game.
Example verified filename pattern: JennyMod-1.12.2-v0.9.5b-forge.jar (size around 4-7 MB)