Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbeaabd3294d935…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b36e52ca26f8a8e1281710f197ff61c2 SHA-1: f350ede0353f73b85333583311166693e262d016 SHA-256: dfbeaabd3294d93563034d3b87781fd173ecaf0e10b6db2fd32aa89b0536d61b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious PDF files. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://moskvaznaet.ru/upload/files/gigatupiwiluboxifo.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/87345862387.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/ludafowimebuv.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/70513910635.pdf
    • http://hijoin.hu/editor_up/fojajereze.pdf
    • http://damutech.kz/upload/2021/09files/2109170809118501146pyb2.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/81243522269.pdf
    • http://evpltravel.com/xv_image/file/lifixakafodos.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/4306485291.pdf
    • https://cobaltinc.org/userfiles/file/xiparalegatatulu.pdf
    • https://neurondevelopment.org/userfiles/file/38219825072.pdf
    • https://aaaxxion.info/images/file/topekoki.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136672b1cf62---nupevulazuderoguvabev.pdf
    • http://residencelesaline.it/userfiles/files/36904027679.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/4618266185.pdf
    • http://pphu-joanna.pl/fckpliki/file/82694729908.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614221093a713---32617117173.pdf
    • http://pibar.tw/uploads/files/202109040651461845.pdf
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/68994246395.pdf
    • http://chinalabware.net/d/files/jixixusenobil.pdf
    • https://liur-krd.ru/userfiles/file/96986577106.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/kotiteki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=no+auto+mmorpg+android
    • 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_off0000b0b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 16792 bytes
font_01_sfnt_off0000c8c7.bin
5cac5c72e9743f46ecfbefa1d45fea03c1f931c52235f1a2aecc3083d04c46d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 10468 bytes
font_02_sfnt_off0000e03c.bin
9d5639fe0f2daa5be32e4c90159484080341964c82b998c18f0da08b4edd33a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 16328 bytes

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