Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af5f176eda193af…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 22:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8871365a8aa03320288d407f8b5fbf0a SHA-1: 3812e029f9d584e50ac8c2a79b449cc5cd313426 SHA-256: 6af5f176eda193afca3e1c4d6456a917093117a4ff0722be017b3aa80f780703
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through multiple redirects and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://termokingbt.com/ckfinder/userfiles/files/71922251733.pdf
    • http://deleeuwputten.nl/site/data/ws/files/favedapelanuxexotatiribe.pdf
    • http://steinbach.casawell.tw/userfiles/file/bekutafufozuzabobewan.pdf
    • http://fioredda.com/userfiles/files/79243540418.pdf
    • http://zrdb-drogbud.pl/Upload/file/xinoxigul.pdf
    • https://salwangurugram.com/files/3441160819.pdf
    • https://oasis-travel.ro/files/34437789428.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/77289678307.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/84719633287.pdf
    • http://dtyxbpzx.com/filespath/files/20210914175008.pdf
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/74916909386.pdf
    • http://fxlcd.com/upload/file/nifeva.pdf
    • http://hmondo.com/userData/board/file/45431593104.pdf
    • https://urbanlivin.lu/userfiles/files/dinavuzesanukirezobizuku.pdf
    • http://cityfate.com/files/files/17661475960.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c116eb0e---zigugufabukabexe.pdf
    • http://apex-architect.ru/images/file/ginamunuwojazajedibu.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f6e527c8464589838f8b56aec2442cda/mojotunatuzawolezemarapo.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/xixadefojavam.pdf
    • http://law885995.com/upload/fckimages/file/91121692579.pdf
    • http://montazerangroup.com/uploader/file/24625918645.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/30525609632.pdf
    • http://zartmobilia.com/userfiles/file/20210906152221.pdf
    • https://rajnnuhiddje.se/userfiles/file/20278267613.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sfvip+player+apk+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_off0000cc4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16792 bytes
font_01_sfnt_off0000e464.bin
5f6956405c29749859d6a6483df9525fb01aac40e5e9cc2653c24bd95d8bc874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10656 bytes
font_02_sfnt_off0000fcf2.bin
3abde2c8691d148b1342351168c6ef44e6a09ed7e9fd8c07aa9b06cde81a6596		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 20108 bytes

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