Is it possible to restrict download and print of PDF files in SharePoint online?

Sharing a pdf file per se is harder to restrict. You could convert the pdf to a pdfe file which would disable downloading. Any major DRM supports this. To make it easy for recipients to view the file by sharing a Sharepoint link without needing to install a reader you can place the pdfe file in an html wrapper that let's you open and view a file within your browser. Essentially what this does is rather than just storing a file in Sharepoint, you are storing instructions on how to open the file along with the file. If you are not a programmer you can use Salepager to accomplish this.