Macbook Pro Invisible "no name" Application stuck on desktop background

A couple of weeks ago, I noticed on one of my desktops that I couldn't drag files or click on anything. When I pressed the windows manager (f3) I was able to highlight a large invisible box that would usually resemble an application or window, but it was titled "NO NAME" and when I clicked on it nothing would open or happen. I can't drag it into the trash and I haven't been able to find anything running in my task manager or in my files. I notice I can drag a tiny icon around the desktop but I can't put it into folders or anything and it doesn't appear to do anything. The hitbox of it is massive but doesn't outline. My computer has restarted several times. One last thing: When I view the desktop from the manager when I'm in a different desktop and it shows the preview, I can see what might be an empty note from notepad with no content. My macbook has no anti-virus software, and I believe it could be a poorly disguised virus operating in the background. Please help.