Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcace4dea96a8c7…

MALICIOUS

PDF

68.0 KB Created: 2020-11-23 08:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fcccdb12c5d6cd379fbbf3fd9787cbd1 SHA-1: dbd13f72055cd77315bf27b0c2ce62f61cbb5b83 SHA-256: fbcace4dea96a8c7678bad778b4eb85d9fcf61d6841016be2f3b7003953084b4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffi.ru/123?utm_term=mercedes+benz+e320+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5fb8a1ed12ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fa1609018ddc.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/wunozenogufibum_naraxu_gigaporuwerex_zavatijovumeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8727c75cc00.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/e6c440f42bab44.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/buromiseme.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/8630308.pdfIn PDF document text
    • https://kifitakuridugiv.weebly.com/uploads/1/3/4/7/134770331/9146894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5faf28b16f74a.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/075fcbfe-448b-4a7a-bb45-2a04131481a9/pubg_hacker_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119581ca-d4c4-4192-8210-7f94b3989a17/68844797549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78d64d3-a0f6-46b9-95e4-2fba04c825f7/casio_fx-5000f_scientific_formula_128_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/weather_underground_tropical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6c3240-199a-4c1e-a119-390523fa4c55/95127752697.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/kemijosa.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_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 5852 bytes
SHA-256: 96840dd264b8bd28a60e3ed208bcb7b4fa67a392cb445b099afd0263c7b8d6c8
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10504 bytes
SHA-256: 0f5add5762af37dbfb7c5e005e8c0302dfffc8efb2a9f62e1100326ac0519804

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