Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d6ee4769187ed6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 01:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0de7fec3a3e8a3d2027996303118b7f5 SHA-1: 5bb108e3c45f9c679699ee215ce15fd2b97480a9 SHA-256: 91d6ee4769187ed67f543a364ea1bc3cac4c96cf0b6497a2e3083516c08c7dcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=cyberpunk+red+core+rulebook+pdf+free+download PDF link annotation
    • http://zhymwz.com/upfile/file/26127755837.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/dcaad7dbe09c2c56c96418252333dbd4/fulox.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/jesuzatumawanelotovivarix.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/46102788805.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/gakaguzaseketugobimu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/71887582615.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/85056420959.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/61073981001.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/medodalolutodigoz.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/74370073421.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/86194055459.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/tetatuzaluwurepor.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/tibomovafabakavixuwi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/52916475065.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/47539874201.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/10263301053.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/reborebofivinekeremajazur.pdfIn PDF document text
    • https://akemi.ro/hirek/file/vuravazopej.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://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_off0000b781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB781 16144 bytes
SHA-256: 9d2ec8e1407f2c8d523945672b99e62d4d512d8669fdc1db557c3c84dce67af9
font_01_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10820 bytes
SHA-256: 00278fd539a38ca38d465c5f38e4376b3e4868910e5c1724f5dd772bf6bc18d3

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