Malicious PDF — malware analysis report

Static analysis result for SHA-256 29209bda45ba8e52…

MALICIOUS

PDF

32.8 KB Created: 2018-06-11 08:30:24 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 6f3003a1162e41d5587e9e73396d8469 SHA-1: 8d835c74663df84075e856a252ff1eff9ffac3d6 SHA-256: 29209bda45ba8e52045b6eb27a7017ac48c28c25bb7922391b41469279e70cde
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.8778

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://uncpbisdegree.com/download3.php?q=yahoo-answers-politics.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=yahoo-answers-politics.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-corolla-abs-ecu-wiring-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/sociedad-cortesana.pdfIn PDF document text
    • http://riverside-resort.net/1/the-commissar-vanishes.pdfIn PDF document text
    • http://riverside-resort.net/1/the-innocents-abroad-or-the-new-pilgrims-progress.pdfIn PDF document text
    • http://riverside-resort.net/1/sport-jet-wiring-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/smartphysics-solutions.pdfIn PDF document text
    • http://riverside-resort.net/1/sports-quiz-and-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/the-girl-i-left-behind.pdfIn PDF document text
    • http://riverside-resort.net/1/the-crucible-act-1-test-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/the-fear-of-maths-how-to-overcome-it.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://answers.yahoo.com/In PDF document text
    • https://en.wikipedia.org/wiki/Yahoo!_AnswersIn PDF document text
    • https://www.yahoo.com/news/politicsIn PDF document text
    • https://answers.yahoo.com/question/index?qid=20080309160143AAwJUpTIn PDF document text
    • https://answers.yahoo.com/dir/index?sid=396545660&link=listIn PDF document text
    • https://answers.yahoo.com/dir/index?sid=396546062&link=listIn PDF document text
    • https://answers.yahoo.com/question/nextQuestion?lang=en-US&qs=REFERENCE&qid=20080309160143AAwJUpT&cid=396546062In PDF document text
    • https://www.yahoo.com/In PDF document text
    • http://mail.yahoo.com/In PDF document text
    • http://www.answers.com/In PDF document text
    • https://images.search.yahoo.com/In PDF document text
    • https://maps.yahoo.com/betaIn PDF document text
    • https://www.nytimes.com/topic/company/yahoo-incIn PDF document text
    • https://help.yahoo.com/kb/mail-for-desktopIn PDF document text
    • https://smarttv.yahoo.com/In PDF document text
    • https://help.yahoo.com/kb/accountIn PDF document text
    • https://my.yahoo.com/In PDF document text
    • https://frontier.yahoo.com/In PDF document text
    • https://smallbusiness.yahoo.com/In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4623 10032 bytes
SHA-256: 5a76f54f258c650824685f59c3576cb7a952d6bb89313e8d78d907a01f69f2f8
font_01_sfnt_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 6752 bytes
SHA-256: 139d90844f4f10d05ef3cf3abac83b5e08b5f5f59d29684463605e6e7793682e