Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2521b3861e50b05…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 17:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3875339c8dc8fd0ec48230930bf7120 SHA-1: ebb16b4865f1cfd32cd2b80462b856d56d8e0604 SHA-256: f2521b3861e50b05e5a3974a73284eee0f44b96b84bfa0bc12fb2f26648357ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. Heuristics indicate it functions as a link farm hosted on disposable domains, likely to distribute further malware or conduct phishing. The presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://uticachemical.com/files/upload/files/relogenikadozosumusowuma.pdf
    • https://vipbeachhouse.com/uploads/editor/file/57469410085.pdf
    • http://elistaprezentow.pl/userfiles/file/duvujamemevaxapat.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l1qks653s00eddp7e1muok5r73/17822006353.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/72954043753.pdf
    • https://x-leather.com/radsportfiles/file/xezelesolonagifip.pdf
    • http://superfishinglewood.com/uploads/files/dotobomijor.pdf
    • http://vanillasky-ch.com/images/files/5061658059.pdf
    • http://mikailang.com/userfiles/file/20210912031902_39975118.pdf
    • http://assytekservizi.com/userfiles/files/44510016955.pdf
    • http://hkxhjfc.ltd/uploads/files/20210904200051.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gikivazamaret.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/24885318852.pdf
    • https://faresaldabbous.com/uploads/files/500798243.pdf
    • http://freeware-software-download.de/uploads/editor/file/68538316820.pdf
    • http://www.jindatunnel.com/up_files/file/dejelunetebipev.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/niderogigidoxomabopiro.pdf
    • https://icbacademy.com/upload/files/54801349212.pdf
    • http://etcpremium.com/userfiles/files/38626306661.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/82378853423.pdf
    • https://arte-salon.ru/upload_picture/92743647200.pdf
    • http://nyitotthaz.hu/userfiles/files/37080287219.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xadefiwefuvotasolaremik.pdf
    • https://toolsatool.com/userfiles/files/73826985534.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kaun+tujhe+audio+song+download+mp4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c211.bin
f9869f2215934aebaade0d6147e15e100ca272ddbbc06e89401d7a89fb28b619		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 11124 bytes
font_01_sfnt_off0000dbb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 16792 bytes
font_02_sfnt_off0000f3c8.bin
746a1340c13b0bd624228971394429bf2ad1b432dafd1b06c112380faa3918dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 17020 bytes

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