Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e240130e7aa3a9…

MALICIOUS

PDF

83.0 KB Created: 2021-03-14 13:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 122316e400b3adb5a703b0b37a149bd6 SHA-1: 7eb91921f4807dff8a56dc237ab9374c4851f991 SHA-256: 98e240130e7aa3a9bfcff9d71b7263612392a9c0b806a95b2ee7def208e551ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to specific manuals, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=managerial+accounting+garrison+solutions+manual+pdf
    • http://juwolopuga.66ghz.com/bionic_arm_project.pdf
    • http://meetchat.space/30734436614o2s74.pdf
    • http://filuxunokenobud.mygamesonline.org/luwokipu.pdf
    • http://kokulotasuz.mygamesonline.org/72872360641.pdf
    • http://rotukefune.getenjoyment.net/march_general_awareness_2020.pdf
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/240d38f7afb56b.pdf
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/kuzemiwogiwofox-jupomatijim-pezoni.pdf
    • https://tatasabazenaxaj.weebly.com/uploads/1/3/2/6/132695883/3122885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gebopotaxe.rf.gd/free_jeopardy_powerpoint_templates.pdf
    • http://dezoruxeg.epizy.com/gadik.pdf
    • http://diwomikutaz.epizy.com/wiganefogiked.pdf
    • http://bopevevene.epizy.com/29353945393.pdf
    • http://wodasakuzetu.rf.gd/what_is_the_meaning_of_good_thermal_conductor.pdf
    • http://tinegomawula.epizy.com/avg_antivirus_free_for_laptop.pdf
    • http://kilaliwe.rf.gd/faxav.pdf
    • http://lagawutek.epizy.com/64865282084.pdf
    • http://gototura.myartsonline.com/dabogufowat.pdf
    • http://nazifaba.rf.gd/dofasonaroge.pdf
    • http://fotigabapeget.rf.gd/neoclassical_architecture_characteristics.pdf
    • http://nejesezape.myartsonline.com/mowiviginip.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc7.bin
c4959d0696912960ac9b7998f21b7ce6965b9715319ff2fb65bbc37997eb16a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 5480 bytes
font_01_sfnt_off00011062.bin
e3edd37edac7c41b1c992ccf51783ff70fa9f3c85aa9b70582225e0f527c1473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 13720 bytes

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