Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbb2de6a0acb2ff…

MALICIOUS

PDF

67.3 KB Created: 2021-02-24 09:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 286fd33165e665ee5bacc8f3701d0038 SHA-1: dee982a892896051147081d6745b509d331949b0 SHA-256: 3fbb2de6a0acb2ffde5cefc6dc531aa3b0f0a96596cf2b46f22c1550516e2e36
206 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable hosting, indicative of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'SE_CALLBACK_LURE' heuristic suggest an attempt to direct the user to potentially harmful content or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/strik?utm_term=how+to+bypass+zone+on+adt+pulse PDF link annotation
    • http://gapeveta.iblogger.org/sejarah_ideologi_liberalisme.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/1920171.pdfIn PDF document text
    • http://reestr.site/bapolilivesiwerilakz8xe.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/gjjjhfN/choice_of_games_the_great_tournament_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/iiJ4xjg/doduwunupoxokuzagogi.pdfIn PDF document text
    • http://8bitbeardsco.com/vin_dicarlo_escalation_ladder11s2f.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/wDicphf/71002099401.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/hayKSic/joker_song_ringtone_mp3_download_pagalworld.pdfIn PDF document text
    • http://new-leggins.site/boston_logan_airport_map7harc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voferinokubusob.rf.gd/kanibafe.pdfIn PDF document text
    • http://tipisane.epizy.com/xixin.pdfIn PDF document text
    • http://kinuvafarugabob.rf.gd/genie_2022_instruction_manual.pdfIn PDF document text
    • http://luselobek.epizy.com/blindspotting_soundtrack_free.pdfIn PDF document text
    • http://fusiwati.epizy.com/duo_pressure_cooker_manual.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_off0000cbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 5200 bytes
SHA-256: 2b664cea057911ece334031c5efda20f89749b913cf6a2a1c416c81e8957763b
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 10156 bytes
SHA-256: a9c9215b9dc968b0eadb5840af54087ab94d5d3a1881361b32228ea4b835c091

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