If you are getting notifications from IntellectualDesk, then your Mac is infected with adware. IntellectualDesk is adware for Mac.
IntellectualDesk changes setting in your Mac. First, IntellectualDesk installs a browser extension in your browser. Then, after IntellectualDesk hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.