Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0cf5099b8e7af1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 04:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2590f62db79833f127ba2e07c1cfa08c SHA-1: 7e349015e99c6880f5cd06fb1dc4e7fb0489e854 SHA-256: 0e0cf5099b8e7af16b295bfbc59716818240c807e3028988473a7a8253f93885
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iccj.jp/images/uploads/fckeditor/file/muramowatajerivemepikav.pdf
    • http://zgic.ru/!upload/files/55926501469.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/komuxuboxegufuwiloj.pdf
    • http://redemaisfarma.com/userfiles/file/fesikuva.pdf
    • http://msslink.ru/userfiles/files/nixorarirejokaji.pdf
    • http://podarox.ru/public/files/21766161771.pdf
    • http://cnokorea.com/userfiles/file/28021818712.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/24155466718.pdf
    • http://pointerboards.com/uploads/admin/files/refufafiz.pdf
    • http://otoozevran.com/resimler/files/60719437008.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/venifipekupozanilofumo.pdf
    • http://imbirimbir.ru/files/49222121743.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/54730664825.pdf
    • http://tagsu.com/attachments/fckattachments/file/92089824520.pdf
    • https://unchiulmihai.ro/files/fckeditor/file/subekisufofev.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/tubowese.pdf
    • http://fizjoactiv.eu/Upload/file/mixuwa.pdf
    • http://drentmedischadvies.nl/uploads/files/71540622426.pdf
    • http://belgium-ex.com/images/blog/file/95005887406.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161346b7129c93---83499833017.pdf
    • http://littlepearlspublishing.in/data/eimages/file/buronafuwizaperupopogul.pdf
    • http://casaledellasignora.it/userfiles/files/28770206192.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/dovoxolodas.pdf
    • http://ablerexthailand.com/userfiles/files/wixatuwutuxepexanofifu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+3+flying+cheat
    • 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_off0000c505.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 16792 bytes
font_01_sfnt_off0000dd1c.bin
a6cac6a8fef0b5dc8c2467a03156eb3a23dc7fe54e6510aabbad61473d3af37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 10552 bytes
font_02_sfnt_off0000f527.bin
61fbf38c435c4f401a8d0c13b56195f5c62ca443b7ef499556c01f6f6d12a15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 18204 bytes

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