Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a868b47a3bb3b98…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 13:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 32cdc4de0ef4c066fbb8933864fcd660 SHA-1: f6c28c88f98ac2bf5a70c8e4ccb7d342d04b2607 SHA-256: 2a868b47a3bb3b987bbd33c639edbeac8a27612ff97b8363f8be0259b675bf59
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a suspicious URL (maypoin.ru) being prominent. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/123?utm_term=top+10+best+video+er+for+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fdc4ba1323d4.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/hdzhggd/jump_starter_for_diesel_truck.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/fjf0hjD/wrestling_revolution_3d_full_version_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_605d7deecca3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_60599803a04a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_6009cec007afb.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/edyBAKN/photo_blur_tool_app.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/hugh_ferriss_the_metropolis_of_tomorrow.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/paradiso_perduto_milton_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_5fe6c1bb8b858.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/miller_thunderbolt_ac_dc_welder_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451021/normal_601a29bf7c965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_605b490446126.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
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_b15991ab776a4606b3385b77a852a0b8.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/business_intelligence_planner.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_063d4ca6ca2e4402bed66469e0e41a70.pdf?index=trueIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/wibafakerefal.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/wondershare_filmora_8._7._2.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/dance_choreography_mp4.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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 5020 bytes
SHA-256: 30cb940412281c3ff912e1d728b2cb253a51f611b0b680f3a3ebdad3ab9c1d0e
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 10852 bytes
SHA-256: cdb3464de6323b8862a57ddbfff74e0be355cfefaed6276a965d34215815a00d
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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