You should get Odin3 from reputable community sites to avoid malware:
: A popular mirror for various versions of the tool. 2. Pre-installation Requirements
Here is how you can safely download and set it up on your computer: 1. Where to Download
: One of the most trusted sources for Samsung firmware and tools.
is a specialized tool used to flash firmware onto Samsung devices. Since it was originally an internal Samsung tool that was leaked, there is no single "official" public download page.