Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33d2d04dfd20fb3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 14:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 432904550e93ea6d960dd2bed952249e SHA-1: 089478c71e428e80e0876e618e8a60877c03f153 SHA-256: f33d2d04dfd20fb3b7e18be35f42e20f81f8c3f576c9363ae81d56dffaf54b93
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a link farm with numerous disposable hosts and UTM parameters suggests a phishing or credential harvesting campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614359f61dff7---31167181453.pdf
    • http://ipoz.pl/userfiles/file/sepenulevuwaf.pdf
    • http://blackivy.pl/userfiles/file/pajademusirugolajun.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/47676455579.pdf
    • http://geose.ru/userfiles/file/satujadidegudikitipetapa.pdf
    • http://ulv-fogger.ru/d/files/70302214893.pdf
    • http://cariboohose.com/userfiles/file/zatadeba.pdf
    • https://soswzgierz.pl/web/uploads/files/nubemeg.pdf
    • http://daiichihousing.net/uploads/news_file/80565516200.pdf
    • https://vanchuyenduongsat.vn/upload/files/gujegipilofonezis.pdf
    • https://my-natural-style.net/upload/files/jojimedurekulukev.pdf
    • http://timebymtm.com/upload/files/fenekuwokebijusegurivute.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wepebiruvaxuzekatew.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mqip3hbi6q257b0n7pbn5ma281/toditufubojekalokaxomu.pdf
    • http://aligokdemir.com/resimler/files/vujakeguzekex.pdf
    • https://beyondpins.com/calisma2/files/uploads/muwulosararinejavemiguf.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foguxebebukodurafifidulu.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/levuvebuvepalebusujej.pdf
    • https://proartgaleria.hu/files/files/51925247666.pdf
    • http://shinex-auto.com/userfiles/file/14156193560.pdf
    • http://acsalma.hu/userfiles/files/46979858290.pdf
    • http://veganogle.es/uploads/ckfinder/files/monavekizofo.pdf
    • http://mskabel.cz/UserFiles/File/75612986860.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=skam+online+english+subtitles
    • 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_off0000b372.bin
6ca97042a88a1c492d42803bc72ba3e1a22252725c15d9b79a03639353dbde94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB372 10860 bytes
font_01_sfnt_off0000cc4c.bin
159318612ca776314a4d98a807e8fe446b2d3727e196f41d0e2b4fde3a8ecb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 18360 bytes
font_02_sfnt_off0000fb45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16792 bytes

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