Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdf03483767c105…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 02:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55939ab2b5bdaf2ef76d21f5adcae06b SHA-1: 218827b2111294b8db7e1631464649808c1bf1e6 SHA-256: 6fdf03483767c1059a35ea8b904fbb2f3d9f98d9beecb15337d048cfeb487c81
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fowifajigoz.pdf
    • https://tattica.byespresso.com/app/webroot/files/upload/files/58289153911.pdf
    • http://slkuang.com/v15/Upload/file/2021916220196337.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ad5afc1a---susukapawejudananu.pdf
    • http://nriloan.jctoursandtravels.in/files/rutifipadafemevema.pdf
    • http://f-kcc.jp/user_data/userfiles/files/65163031567.pdf
    • http://www.gonouvellezelande.com/files/5093954302.pdf
    • http://eskuvoiiranytu.hu/blog/file/zesabamofarosivot.pdf
    • http://gsemilia.it/userfiles/files/jumedabewovasuloj.pdf
    • http://constantcontinuity.com/membership/data/files/diluwubekorob.pdf
    • https://deniz-sogutma.org/img/userfiles/file/satolepewudesavazesipopez.pdf
    • http://sunmoon-glory.com/web/upload/files/newuvirumeparij.pdf
    • http://jeykrishnaclub.com/images/file/33317015574.pdf
    • http://neapol-m.ru/usr/file/23087767416.pdf
    • http://jmyhship.com/uploadfile/files/kixugabigoredaj.pdf
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/99229227693.pdf
    • https://sharjahcements.com/images/bulk_images/files/49435044966.pdf
    • https://podimercrm.com/img/files/76016627128.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jitivajugej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=blur+mobile+game+android+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_off0000d3f1.bin
74e36aa795e8bdeabf5add73b35547c6910689829741412a23a10559fc66778b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 16896 bytes
font_01_sfnt_off0000ffb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 16792 bytes
font_02_sfnt_off000117ca.bin
1d2ba9d12daf689b4021a9d88e10d931e6155b158aa7148ae3c4b7fe97d1d13b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 10704 bytes

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