Find the PDF object that URLs are stored in

Thanks to plinth (https://stackoverflow.com/users/20481/plinth) on Stack
Overflow, learned that URLs are stored in /A entries in a PDF:

> To get the link to go somewhere you'll need either a /Dest or an /A
> entry in the link annot (but not both). /Dest is an older artifact for
> page-level navigation - you won't use this. Instead, use the /A entry
> which is an action dictionary. So if you wanted to navigate to the url
> http://www.google.com, you would make your annotation look like this:
>
> << /Type /Annot /Subtype /Link /Rect [ x1 y1 x2 y2 ]
>    /A << /Type /Action /S /URI /URI (http://www.google.com) >>
> >>
https://stackoverflow.com/questions/19492229/add-a-hyperlink-into-a-pdf-document/19496996#19496996

To extract URLs, find the /A objects and get the text value of their
`URI` fields.

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