This is what i found out.

for i in range(len(reader.pages)):
page = reader.pages[i]
# Extract text from page
pdf_text = page.extract_text()
# Print all URL
if "/Annots" in page:
    for annot in page["/Annots"]:
        annot_obj = annot.get_object()
        if annot_obj["/Subtype"] == "/Link":
            dest = annot_obj["/A"]["/URI"]
            print(f"page: {i} dest: {dest}")