Malicious PDF — malware analysis report

Static analysis result for SHA-256 537be1f125a5a672…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 22:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20c9ed673ab18239560d0748a99f5fd1 SHA-1: 3a96afe3ce4d83f041b50a74050dceb4a25e55d8 SHA-256: 537be1f125a5a672fc80e2c9d4304cf2b14d6d500e06765354fe765f6aed68cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=avengers+endgame+comic+pdf
    • http://gps-ambroisie.com/ressource/site-image/files/sotuwejivoju.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6602926600.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341a3d096bd---99890017080.pdf
    • http://rewitex.pl/userfiles/file/pareguxelomu.pdf
    • http://xaydungphongphu.com/uploads/files/vesegoz.pdf
    • http://qdjshg.com/files/file/91354342964.pdf
    • http://yingtailong.com/upload/file/210907120017022963rgo97k9p8gxg.pdf
    • https://studiecarriere.it/uploads/file/wanarinozizajavuwulazef.pdf
    • https://daulte.ch/ckfinder/userfiles/files/tixifowuvepirejow.pdf
    • http://446888.top/userfiles/file/484381628.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/zefilopevasijozabedorep.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/8502168090.pdf
    • http://qkmedica.com/uploads/userfiles/file/95901119570.pdf
    • http://mariekevanvlierden.nl/survey/userfiles/files/24824021228.pdf
    • https://landtop.com/filespath/files/20210902071438.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342795d8c19---supozikotibajevo.pdf
    • http://csc028.com/userfiles/file/20210907181208_fhxt2w.pdf
    • http://sibmaxi.ru/userfiles/file/29665237906.pdf
    • http://sparkpro.lv/content/file/58799323823.pdf
    • http://artkulinaria.pl/sites/default/files/file/52134462132.pdf
    • http://khacvietlaser.vn/public/images_news/files/sulozomib.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_off0000e331.bin
84d06c6374f58b77b6378562357d2f43150d76ed1ab7776e6bb79a3274283ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 18524 bytes
font_01_sfnt_off0001137c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 16792 bytes
font_02_sfnt_off00012b93.bin
1d33f87fac0e0742782c53e95cd3b6dd4ac21b1e37aec247ec84d9b255eb7b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 10864 bytes

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