Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07847c66db86e2f…

MALICIOUS

PDF

70.8 KB Created: 2020-12-31 01:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 73560d75e4c9001ecaadfa3d2298c604 SHA-1: 9d8f97283e0b305a00a0668c910d0fd5cf214966 SHA-256: e07847c66db86e2fedf4d94d42196e2854056004483d131800122ab534f57e11
186 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. 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 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://trafffi.ru/strik?utm_term=new+york+city+fc+soccer+specific+stadium PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fdfcd661d69f.pdfIn PDF document text
    • https://kalizijowu.weebly.com/uploads/1/3/4/7/134733304/4848733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5fd6c467c365e.pdfIn PDF document text
    • https://nezumise.weebly.com/uploads/1/3/4/2/134265586/b8c4a04d.pdfIn PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/kixom-lisorevuwumar.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/v3jjbhj/vampire_s_fall_origins_rpg_guide.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/saselivevivem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407782/normal_5fdf64087d577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e54053-3a66-46ab-9193-6a91e6d17e2a/rutgers_student_parking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb63997-7e5f-4ffd-ac83-649f830f9d82/25416731651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e226e05-8f86-48db-8340-41dd1071259a/how_many_neutrons_will_chlorine_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca7aefe-8744-4621-b795-d74f0e4d32d3/kofagatefarek.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/class_dojo_app_free.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 5496 bytes
SHA-256: ec5ea13cbd077639a409852232e9fbe92b168f1a3d6183f1ab5fc160284b3c00
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10480 bytes
SHA-256: 532402e3811c093f571d3db397c9b7ce9f3dfe8154be05dc5735a150cdf865d4