Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd406d50214639d…

MALICIOUS

PDF

70.4 KB Created: 2020-12-22 23:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d15bb47cf07ea542807db0c9a5d8a498 SHA-1: 87d8e40f3f145f0c2d002d8cfbd7218a71cfbfa7 SHA-256: cdd406d50214639d368db9d1c8131191a9a0b02163f6dbe14ccc9aba08a98d24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, with a primary suspicious URL identified as trafffe.ru. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The document body, though partially garbled, contains keywords related to the suspicious URL, suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://trafffe.ru/strik?utm_term=hidden+valley+ranch+secret+sauce PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384652/normal_5faf07c1025c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fba6d9bedb19.pdfIn PDF document text
    • https://tumebadov.weebly.com/uploads/1/3/4/8/134863232/5ca11cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f9420d924c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_5fb29dc156ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fa02e856e7e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fd096f04f6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f8c9e477bd7b.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/powaxorisavasar.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/jinexalokemuv.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/wunebesebowowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobaziw/fivupe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6ca4dc89b935f15dddeb7/t/5fc813bd8bd779356741f7cb/1606947773620/knife_throwing_target_games.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc34e16fa04221c718a01e2/1606635030966/3848803931.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe161cbc819f1cf4a0ad09/1606293021309/bell_bike_speedometer_manual.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 5148 bytes
SHA-256: 70d48b6b4513532857fa5870c8ac72cd8f01d05cd0efb7bb11469c16245d4079
font_01_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 10892 bytes
SHA-256: b8a7836fe3d8a70403ec5582295eef3548629d0d870a48cb72cedb3e408770c0

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