Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae8aa331e5b37a6…

MALICIOUS

PDF

84.9 KB Created: 2021-04-13 19:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c15383132a70292245c173d53806245 SHA-1: 936e0a0345165879d5c156cc34f042483568cb82 SHA-256: 8ae8aa331e5b37a68fe6128e3074ef1527eee051efa13017e06d21b5e5c4bf8d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely intended to host a phishing page or further malicious content. The document body, though heavily obfuscated, appears to be a lure related to search engine results, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=how+long+do+g+shock+solar+batteries+last
    • http://jamotovoxut.mywebcommunity.org/2111209371.pdf
    • http://gakukuketisalum.scienceontheweb.net/cognitive_dissonance_experiment.pdf
    • http://lugabev.mygamesonline.org/68913563328.pdf
    • http://rujakagixawimir.22web.org/cuet_admission_result_2020_19.pdf
    • http://pokezokebawi.mygamesonline.org/57225853457.pdf
    • http://rivilidopu.medianewsonline.com/43974255250.pdf
    • http://nikibolerobika.getenjoyment.net/62946507082.pdf
    • http://zurafumodajirof.iblogger.org/adobe_reader_7_free_download_for_windows_xp.pdf
    • http://lazokiwumemo.mygamesonline.org/88282173621.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6068053095db3.pdf
    • https://cdn-cms.f-static.net/uploads/4377115/normal_604d2c64d8fa4.pdf
    • http://matawobedopikam.mywebcommunity.org/gijiji.pdf
    • http://midunetojonawiw.mywebcommunity.org/deadlock_prevention_in_os_tutorialspoint.pdf
    • https://cdn-cms.f-static.net/uploads/4401540/normal_600c360e2ab5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sugosubexez/pedonenosoluludol.pdf
    • http://mesujexu.rf.gd/2517815993.pdf
    • http://naxefugoxodikow.atwebpages.com/82563723815.pdf
    • https://s3.amazonaws.com/jolituzoji/pezifosikolowoge.pdf
    • http://dakafatuvuguviz.atwebpages.com/xoguxo.pdf
    • http://vigexosav.myartsonline.com/98555444053.pdf
    • http://mafonevaverazux.atwebpages.com/avengers_infinity_war_theme_piano_sheet_music.pdf
    • http://rigirulame.epizy.com/7348014186.pdf
    • http://pasofotamuteper.atwebpages.com/negafexejiwip.pdf
    • https://s3.amazonaws.com/wewiro/biscuit_recipes.pdf
    • http://zepizevut.atwebpages.com/english_grammar_for_ielts_8._5_free_download.pdf
    • http://zimefiji.rf.gd/zewivabidaxuwudoxirak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a1.bin
823fef24e2f1856340ff4c69fba973ec4b19ff48c9c5e74a7ed10069a56b143d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 5244 bytes
font_01_sfnt_off00011277.bin
735b3f37d6d8ce0e9b43f5da548b69aa57e6d51b34442a53ee554095a8bbccb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 10844 bytes
font_02_sfnt_off00013799.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 4324 bytes

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