Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c51438d73cda36…

MALICIOUS

PDF

65.5 KB Created: 2020-11-24 16:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bb8a7166d493a1d8379814848f641434 SHA-1: 91938ed26fc74c574e4b6c32843885d4ae6dc768 SHA-256: 78c51438d73cda36367f67ede329b89852fd51babf562dc80f7b3032eae6b268
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-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.
  • 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://traffnew.ru/strik?utm_term=destiny+2+nodes+and+protocols+locations PDF link annotation
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/172878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f88d05a8f887.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/lubupunajagob.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/ad9023.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/843f1c855.pdfIn PDF document text
    • https://jewibotiguduxi.weebly.com/uploads/1/3/4/8/134864220/wevozorepagudogexig.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/872dd0.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/2812572.pdfIn PDF document text
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/gubijimewiw.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/sopemifekumexena.pdfIn PDF document text
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/beneru_zizoposonugeris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 5300 bytes
SHA-256: df618e699e353cf48dcfe6b134481777e9f1a79c12c4c30bfdf8726827291371
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 9920 bytes
SHA-256: 1417134e74e9e800f47ee09f2a8e2d77d99a499983a601324ca1e0a3108e0e87

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