Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ec7f9ea8036f0b…

MALICIOUS

PDF

85.6 KB Created: 2021-02-20 22:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 465c8e96e659982dfdba4e496b6e6bcd SHA-1: 4fe5b7c4927b2571aa620806a835ae1b93f400ba SHA-256: 37ec7f9ea8036f0b14d9475df454bbecbe450747455d30449b7cb651187be76e
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=digital+logic+circuit+design+simulation+software PDF link annotation
    • http://sefajoga.iblogger.org/27917069411.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/gilopopo-fowekafapum.pdfIn PDF document text
    • http://gbo.guru/bifo_cmylmz_720p_izleas8wm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_60037c4108382.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://beranaja.epizy.com/html_template_for_api_documentation.pdfIn PDF document text
    • http://zezogif.rf.gd/nct_127_fire_truck.pdfIn PDF document text
    • http://kudukel.epizy.com/hustle_castle_artifacts_guide.pdfIn PDF document text
    • http://poniweja.rf.gd/70905258204.pdfIn PDF document text
    • http://batuzotunar.rf.gd/door_prize_ballot_template_free.pdfIn PDF document text
    • http://nujexaraxeb.epizy.com/brain_teasers_puzzles_with_answers.pdfIn PDF document text
    • http://poposumezaxek.rf.gd/14554740925.pdfIn PDF document text
    • http://gapevizatijaba.epizy.com/19058996484.pdfIn PDF document text
    • http://gubogur.rf.gd/jikerezil.pdfIn PDF document text
    • http://wefukuw.epizy.com/flip_animation_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 5312 bytes
SHA-256: 01a4f3ee1e8ec3872abc67a8cfe53cb206cd4d806bbaef36d6e6e446294252ab
font_01_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 10572 bytes
SHA-256: eda594486025edcaf32a7a23bb74ddade2ac103653845481598162caed832a10
font_02_sfnt_off00013ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378