Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf139c9be93f4f5…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 04:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae575f16573138f241e3681311a13646 SHA-1: 1befc2cc1e68f224cb29469d68dcaba896c0fd61 SHA-256: 2bf139c9be93f4f5c180a49216ba092da68adc8863fdb86e7800427dea631cb6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the final destination. The presence of 'utm_term' parameters in some URLs suggests tracking or redirection, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://badanie-wody.pl/galeria/file/xevofu.pdf
    • http://woodlander.sk/grafika/file/13195825785.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/zitapix.pdf
    • http://shriadinathbank.com/uploads/34525124679.pdf
    • http://trieuduong.com/images/Download/25932228080.pdf
    • https://altstudio.be/app/webroot/uploads/file/34992537327.pdf
    • http://siciny.pl/userfiles/file/pagaxabevu.pdf
    • http://f-kcc.jp/user_data/userfiles/files/vofivodatunegiwupuxef.pdf
    • http://harnettcountyhba.com/userfiles/file/borukeranujoxosebig.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/38258706880.pdf
    • https://booknowrentalimo.ch/userfiles/files/25620794494.pdf
    • https://eqonetech.com/upload/userfiles/files/depijowetovitezedafipule.pdf
    • https://agri-mal.pl/userfiles/file/vejezikososakagofoniseteg.pdf
    • http://medtravel.pro/images/hand_uploaded/files/24883194995.pdf
    • http://levne-pohary.cz/UserFiles/File/93854368386.pdf
    • http://snft.ro/media/file/vunefox.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/zuranorediludidololi.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/14713450988.pdf
    • http://gazdalkodjokosan.hu/img/userfiles/file/duzukijiloravutizojoz.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/bb7a8c73ab1d0acf0dc885d2c2cf4f3a/dopol.pdf
    • http://hycxchina.com/filespath/files/20210904142731.pdf
    • http://vssteel1999.com/ckeditor/userfiles/files/silazuladiwidura.pdf
    • http://obraz-tlt.ru/userfiles/file/wimoraz.pdf
    • http://altera.ukrstroyka.com/content/xuploadimages/file/lurimabo.pdf
    • http://demirlermetal.com/resimler/files/fabuwosajulovitonej.pdf
    • http://ingenermarket.ru/userfiles/28173180355.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=damon+ps2+bios+download
    • 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_off0000eb50.bin
c389962c56ac2252482ed4d4e2f67bdc5d6faae971427835981679b19683010e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 19964 bytes
font_01_sfnt_off00012004.bin
0b8ed3c8fb2c5d1733b343df71b1aca8cdadf2fa3431d49fb146ffd83d877e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 10568 bytes
font_02_sfnt_off000137e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 16792 bytes

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