Malicious PDF — malware analysis report

Static analysis result for SHA-256 afab951d10590f63…

MALICIOUS

PDF

87.9 KB Created: 2021-09-24 08:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7aed69d859abe4f9f9c3bf41579ad1c0 SHA-1: 6310d8af2814a275d6a99030a5e4d50c4dabb42a SHA-256: afab951d10590f63188b23f298974d815f78698ee380ae8e5ca9ff79322d62d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable or unknown hosting. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://a2itsolutions.com/chop/multimedia/userfiles/file/13146572365.pdf In PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/rifunu.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/litix.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/detozufuxexifivoz.pdfIn PDF document text
    • https://matrixx.lu/images/dewaxajofisabukaxafemixup.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sebadubuto.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/65154610423.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/jivogoxejebujunafovano.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/devemarepogutivasez.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixaxid.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/33568390248.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gabon.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/59925086606.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/44102042715.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/92709463983.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/61717175752.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/zipetozunizog.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/73946284814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=xamarin+android+busy+indicatorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 21740 bytes
SHA-256: 0513b06951d5aacbc17283a586ba3bb891d831410cffeb3fad1b72409c6a71fe
font_01_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 10716 bytes
SHA-256: c2aec631e1b5dec850256b6f89dfa8d5fb18eebc9db9bf6cb3edd8f95ea2c433
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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