Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f06d5fe0a63dd86…

MALICIOUS

PDF

72.7 KB Created: 2021-01-25 07:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae25beb82edd1fea4e20a850125e3b08 SHA-1: 7fe7c6008195d269017a4e2c66e2db85ccd8d8d5 SHA-256: 3f06d5fe0a63dd86289f436af903850735d366b08ab0cf9100d1272d0dfb7aa5
126 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, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'bologen.ru' and another to 'zazedosipafefu.epizy.com', indicating a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://bologen.ru/123?utm_term=sistrurus+miliarius+barbouri+kaufen
    • https://cdn.sqhk.co/dilizilozok/egehi1h/domigopefugazile.pdf
    • http://piwudev.iblogger.org/galoneregasegoxo.pdf
    • http://airbin.top/fastest_diesel_tune_pro_series_drag_racing4mubf.pdf
    • https://cdn.sqhk.co/pexufenek/aPigbKI/wyze_promo_code_september_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4450338/normal_5fe9104c7d841.pdf
    • https://cdn.sqhk.co/gevajoke/if2yqP1/momobawerodozafe.pdf
    • https://cdn.sqhk.co/jabakujivim/rvhdnhe/monster_city_fresno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zazedosipafefu.epizy.com/bible_quiz_fruit_of_the_spirit_answers.pdf
    • http://wasaxotudulolo.epizy.com/liferimovevefuda.pdf
    • https://s3.amazonaws.com/vavale/25288386492.pdf
    • https://s3.amazonaws.com/tejuvonixag/chi_square_test_biology_worksheet.pdf
    • http://logapazop.rf.gd/capricho_definicion.pdf
    • https://s3.amazonaws.com/debamijizozexo/39895505455.pdf
    • http://gexovudin.rf.gd/vaxajetegubilaw.pdf
    • http://butevagowug.epizy.com/bharat_mata_ki_jai_ringtone_pagalworld.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_off0000e04a.bin
2951b9ac455d260cd02f686140336d14090f23c00afc48854383bda5f5e56858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5220 bytes
font_01_sfnt_off0000f1f5.bin
42a1bc998fe101f00bd847fd56b89f96e4c54c4e11d0fce99acb024846ec80b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10548 bytes

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