Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74e7edae4c762f9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 19:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f8a66485ca4ffd77d075108d755c29d SHA-1: 567848016757c9c0b107fab2e444a94cd6510144 SHA-256: a74e7edae4c762f9a349c692a993439da915795eff588621e33a3714f822e1d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware. No scripts were extracted, but the primary attack vector appears to be luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=best+call+recorder+app+both+sides
    • http://ktcz.eu/files/files/72279747490.pdf
    • http://piemonteforyou.it/userfiles/file/kokatosilibalojofimuwun.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/nopil.pdf
    • https://xyoaa.org/sites/default/files/files/nidopom.pdf
    • https://harteron.ee/userfiles/file/85297048611.pdf
    • http://www.giuseppe.ru/ckfinder/userfiles/files/65809339034.pdf
    • https://amatnieks.com/pictures/image/70981195593.pdf
    • http://autoneza.cz/UserFiles/File/vukabuxaso.pdf
    • http://gmicropilotes.com/uploads/files/zisafojaliwuwejisuwa.pdf
    • https://kaptenhoki.info/contents/files/vofurononizelo.pdf
    • http://antitumor.org/filespath/files/20210912220316.pdf
    • http://ajtoablakcentrum.com/_user/file/94043834153.pdf
    • https://akgoz.zemta.com/uploads/files/tuseminular.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/mazibu.pdf
    • https://cupanghitam.com/contents/files/61659873998.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/xiroxafifajemaja.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130815534d15---75979142641.pdf
    • http://3234.us/data/attachment/file/64004693200.pdf
    • http://chandigarhdatarecovery.com/files/file/26557960966.pdf
    • http://www.gamylai.vn/uploads/files/51943896875.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a9de8d2d44b2eb651c6c43dc75562d7e/68794167745.pdf
    • https://ykitraders.com/UserFiles/file/77207609987.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_off0000af77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 16792 bytes
font_01_sfnt_off0000c789.bin
9743b2f65b1615fa92dd2ac3fd6e32484dd47da33995fc72da8c8431731d3ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 17488 bytes
font_02_sfnt_off0000f471.bin
bc4b78caeabfe2ecd810965aae7be23c03a8dbafc157b67ed8b7a42c55df6310		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10700 bytes

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