Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f177acfba337cfe…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 23:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac7d595d4c7edd457a19e66e1a0fccf5 SHA-1: e18188b2522a4993a6b1870bc0348f7761e8abcc SHA-256: 6f177acfba337cfee5e76c753849e6132fdfec977295d27cdfb7fe9b0565a5de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a distribution or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=lite+speed+vpn+apk
    • http://pb-book.com/user_file/file/badoludepusekijadef.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/249ef2859e8c4e87913ee79df607299b/fewusafekam.pdf
    • https://ancoraeducacion.com/images/76436577560.pdf
    • http://kaus21.com/userData/board/file/zazimumenuxotazuseso.pdf
    • https://fotografski-studio.kost.si/userfiles/file/kexagavatozobu.pdf
    • http://biurod9.pl/public/userfiles/file/bikideve.pdf
    • https://xuanhongkhang.com/upload/files/pipagapiwozokenusosakarav.pdf
    • https://bunian-co.com/other_files/File/zudabudimaripopel.pdf
    • http://thangmayedex.com/webroot/img/files/buxevonunidisovu.pdf
    • http://dinskayarealty.ru/media/file/24357512081.pdf
    • http://hainescentreasia.com/images/file/38951431880.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/nelonunumiviv.pdf
    • http://simsvizag.com/contentimages/file/xekuz.pdf
    • http://izr.fr/files/81907996431.pdf
    • http://cabini.it/userfiles/files/70240419504.pdf
    • http://suphammamnon.org/uploads/files/renelezorow.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/dufowoxitev.pdf
    • http://lycee-elm.info/userfiles/file/69440722487.pdf
    • http://spokoino.ru/i/upload/files/29352138100.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/somopepuvibasunirife.pdf
    • http://derkwoo.com/upload/editor/files/jozel.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada92007fe---56937636000.pdf
    • http://terezszilvia.com/images/uploaded/file/83028266565.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/73105381788.pdf
    • 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_off0000b076.bin
6423ec1c3147f87b74728ea7ca337343b5b7cfc3cedffcd61dcbacf4cfd7f11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB076 10232 bytes
font_01_sfnt_off0000c79f.bin
65516d6edb021984e9fe97eddca74aa172e2e54b1d5e043dc7a2f88aa87ffd8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 14908 bytes
font_02_sfnt_off0000ecab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 16792 bytes

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