Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e54bfb0ce0d0012…

MALICIOUS

PDF

98.7 KB Created: 2021-09-11 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2c82ba2482af3f38f979d9c02123b7cf SHA-1: f5985f7bf4205dc168496d72ca9f891fd9a0a56c SHA-256: 0e54bfb0ce0d00124e3e70a88bda6fe8777ab9ef014bed3418b3ebfe4bc3f3dc
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the structure as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cristalensi.com/public/File/54166991936.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/81067684660.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/fimeb.pdfIn PDF document text
    • http://khocabien.com/uploads/files/bululidiwafefoxusofanat.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/52445469631.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/81097792100.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/pesoparulexagi.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/bejigezasosodezitudivul.pdfIn PDF document text
    • https://auto826.com/uploads/files/106273896.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/94041782200.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/guferobudebukutamusetis.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/pegujumejan.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/17349018440.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/goxeku.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/98545634588.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/8742454752.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/donamegizotufolif.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109011345235261.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/pixewomagegelaxenuka.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/gukudagegozejonejowitine.pdfIn PDF document text
    • http://hinodanang.com/uploads/image/files/56836520267.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/64229240152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tfpdl+official+sitePDF 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_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 18256 bytes
SHA-256: ac62a2405628f002cf20b97dce1e39f1a95fadf94a44f785616e85991be2de67
font_01_sfnt_off00014c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9C 10372 bytes
SHA-256: 7912093ff8aeebe154b3e35a2561bbebcf448d6e4bf2ad4ee709cd858f42529a
font_02_sfnt_off00016432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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