Use Analytics + Tag Manager to track link clicks of specific URLs

For a PDF brochure that is accessed through a banner link, how would one track the clicks on that banner using Google Analytics and Google Tag Manager?

I’ve been following this tutorial, and this one.

Because a PDF isn’t a page that people land on, nor is it outbound, I need to do this a little differently than in the tutorials (which focus on tracking outbound link clicks).

I’m a noob with Tag Manager, so please include details, and don’t hesitate to explain the obvious. Thanks.