Malicious PDF — malware analysis report

Static analysis result for SHA-256 531894b4ac59de24…

MALICIOUS

PDF

82.7 KB Created: 2021-04-20 02:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a066b03a4c384d4ffb697b1f208fcf7 SHA-1: 7648a59f9fcc7803e85ea51c6d639b33f138880b SHA-256: 531894b4ac59de249f5832f295594533b03d90947e1949059ea0ce57c7e3b46c
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'vilenefex.ru', which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, suggests a product listing lure, consistent with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=shimano+ultegra+di2+disc+brake+set
    • https://cdn.sqhk.co/temetixufuxi/dieiiie/85350979310.pdf
    • http://sifiridukujofa.22web.org/49561546621.pdf
    • http://wenenejenataf.iblogger.org/lepejifasasedew.pdf
    • http://gubixazolela.sportsontheweb.net/zibow.pdf
    • https://cdn.sqhk.co/figakeves/CheCgfN/pagifekebufimazu.pdf
    • http://nupifijaw.getenjoyment.net/xutuzukeko.pdf
    • https://cdn.sqhk.co/loxexafetivu/mLjdgg9/48597185982.pdf
    • https://cdn.sqhk.co/dudilabatod/jihiege/88042755744.pdf
    • http://wanezus.scienceontheweb.net/curriculum_development_book_by_s._m_shahid.pdf
    • https://cdn.sqhk.co/nomitusibop/ghixmf5/stalker_misery_money_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c80c99cf-1494-428d-a9f0-914e4d800cd2/32845079363.pdf
    • https://s3.amazonaws.com/piradi/income_statement_format_for_retail_business.pdf
    • https://s3.amazonaws.com/xeponodij/what_is_the_secret_of_the_pyramids.pdf
    • https://s3.amazonaws.com/vabedafozo/spyder_xtra_parts_diagram.pdf
    • https://uploads.strikinglycdn.com/files/93d348ec-c0f3-4828-8813-10dbc84ff2e6/mansion_on_the_hill_lyrics_alabama_3.pdf
    • https://s3.amazonaws.com/zerepuzuze/the_crown_season_3_episode_7_fact_check.pdf
    • http://bowudizukeb.epizy.com/wheat_belly_diet_scientific_review.pdf
    • https://uploads.strikinglycdn.com/files/0df92c15-4ffa-4977-b74d-df0b87750cd2/pogibujowajesixaf.pdf
    • https://uploads.strikinglycdn.com/files/bfb290ff-8ec4-4828-b8ed-bb43ad481b1f/wujawupobedunewa.pdf
    • http://nelifofufotilep.epizy.com/lusafotunejigepalexudu.pdf
    • https://uploads.strikinglycdn.com/files/7f0b07d6-421a-400d-ad8b-a9dff5babd88/the_invisible_man_review_2020_imdb.pdf
    • http://nibubatovavav.atwebpages.com/xitokonisisoje.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_off0000fad2.bin
97de1ff40fbd499e1122c9b7093d3bd720af2644e5809f920bad8cc68d69eddf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 5792 bytes
font_01_sfnt_off00010e5a.bin
18dae2ee026a1b232490e00604a931dba510664cf3ed9a572ef6f8ea93c21f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 14764 bytes