Malicious PDF — malware analysis report

Static analysis result for SHA-256 04260f561f3d403f…

MALICIOUS

PDF

93.1 KB Created: 2021-09-08 21:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9be3d3f0f6959033e275a1708131b436 SHA-1: f8aead8dfaf2bdd73aa5cddfdc29d81c76d9131e SHA-256: 04260f561f3d403f87051d6bee4d7b67a940af78eac29f949bee4bb879145ae7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through the linked content. The presence of embedded JS suggests an attempt to execute code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://badgerhillfarm.uk/85621561358.pdf
    • http://zussobrance.sk/grafika/dokumenty/17568532672.pdf
    • http://shinex-auto.com/userfiles/file/jogoberelemaki.pdf
    • http://caratow.nl/userfiles/file/99731695804.pdf
    • https://tainandentist.com/uploads/files/202109061917058333.pdf
    • http://dnepropress.net/files/file/linitupekapewuseru.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bitalexutarakeduxuvafeteg.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jelolaler.pdf
    • http://steinemann-ag.ru/nimatiwasisoko.pdf
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/piduwixejogavunutamaxeka.pdf
    • http://tv-sat.cz/userfiles/file/ruwojiz.pdf
    • http://amsaneeraus.fi/userfiles/files/vafaj.pdf
    • https://worldpigment.com/image/upload/File/katafadifakin.pdf
    • https://alzubidi.com/userfiles/files/24969984581.pdf
    • http://pro-group.ru/userfiles/file/firipijivafaxuxavo.pdf
    • http://1-cities.com/blog_images/blog_/file/dusabiradojo.pdf
    • http://bpabv.nl/uploadfiles/file/saganabuzevonodajirure.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/wivinepikoxodo.pdf
    • http://swhos.com/upload/files/maparedoku.pdf
    • http://tuzvedo.hu/elemek/file/sikutejajigux.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/e138epbse6vbnfk1no8odtqth1/6097764912.pdf
    • https://sunkamalzemecilik.com/userfiles/file/79477876497.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/zurufasin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=perceived+organizational+support+questionnaire+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_off0001038e.bin
5fc2f42b33e5f3766b38137365cfcb0d6f41ac8f8916f87e03a812e8c763eae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 11168 bytes
font_01_sfnt_off00011d57.bin
11fa723ffbbdbd3d45d32eabf85de0ff838eb5bcb13a09ca7b8060d2a3de5c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 18776 bytes
font_02_sfnt_off00014dcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCD 16792 bytes

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