Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c4e725e38ab9ee…

MALICIOUS

PDF

71.0 KB Created: 2021-03-28 00:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 746e713d01e3c779abd8f824b5ce1330 SHA-1: 7cc647c8b116828ac7ac0184df36e3e1c329a8c7 SHA-256: 33c4e725e38ab9eeaa431a2b5bfbade4f70b491c47d9f5841cb191d164445e29
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous disposable hosting domains further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=every+praise+chords+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601ee3bf6e2ea.pdfIn PDF document text
    • https://mikezopa.weebly.com/uploads/1/3/4/3/134366842/32243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_6047f83c06770.pdfIn PDF document text
    • http://mibijuzorifif.getenjoyment.net/2145976505.pdfIn PDF document text
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/718373.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/fKtgjhj/virinidiwelusuzevu.pdfIn PDF document text
    • https://gexuganogos.weebly.com/uploads/1/3/0/8/130813630/6417491dc4e.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/Chbsij3/l_alphabet_phontique_international_franais.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/tutorial_adobe_premiere_cs3_bahasa_indonesia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_60560c7533620.pdfIn PDF document text
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/zefirevamawavu_dotilubonax_veguvareded_wenafisu.pdfIn PDF document text
    • https://sudewivozuv.weebly.com/uploads/1/3/2/3/132303071/zilosidixoba.pdfIn PDF document text
    • https://visegonikagade.weebly.com/uploads/1/3/4/6/134626066/5ab5942f.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/milarexi.pdfIn PDF document text
    • https://fogorito.weebly.com/uploads/1/3/5/3/135322632/rakukutomiwunawaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jonora/apache_ant_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/faduvituvoxujaxinusa.pdfIn PDF document text
    • http://doxokalisawe.myartsonline.com/millennium_development_goals_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/bufopepukeduzobokoli.pdfIn PDF document text
    • http://rabelame.atwebpages.com/madutajat.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/family_feud_game_template_for_mac.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 5248 bytes
SHA-256: 02501d7f3d4fa5aaa7c82823588bc9e07f7aaf26281f27de03bdb5957aa2b81d
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10696 bytes
SHA-256: 52831127c1baee7a4705a9e003799430fe258afa298f9623e99a2c01e35ed610