Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8c9a90d3806c24…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 23:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22a20a2f33ac0367df7e1a9c796703e3 SHA-1: 8c4e62e783b68c678f6eaae8e3af3f35afa2fb6f SHA-256: 9f8c9a90d3806c24bc7ad50f080cb3a5753677beec9fad3dba4ec179f5710877
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs pointing to what appears to be a link farm, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sushinamu.com/uploads/files/velutubabaweg.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/67341861671.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/gadexikokisibepiluteferex.pdfIn PDF document text
    • http://glassick.com/userfiles/file/wobuguvunidalokoloras.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/66863723718.pdfIn PDF document text
    • http://kmjjt.com/uploadfiles/file/221956506649.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lp4cjf89v8grt8j8eiuo7ehbhn/zugakomomosiveji.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/88158092799.pdfIn PDF document text
    • http://vladekoservis.ru/files/30331663573.pdfIn PDF document text
    • https://wasael.com/userfiles/file/83413676348.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57847857184.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/63420360828.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/24041713977.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/popomunenoruxixulojup.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909150456627049gy9mn.pdfIn PDF document text
    • http://splogservice.ru/content/files/16080389203.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26531225361.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/1058735239.pdfIn PDF document text
    • http://rsst77.ru/upload/files/sapukolo.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/46031257731.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/seforoj.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/81093041285.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29218861293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+apps+for+android+tablet+freePDF 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_off0000b2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 17100 bytes
SHA-256: 775699c3a96018c1796aaaf7f98812894c390801286b166d987fb62ec953bd67
font_02_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 10684 bytes
SHA-256: 32a2036c2949f9ac3780ce461e449eb91ee19127294abd57aa0bd265d5055d20

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