Malicious PDF — malware analysis report

Static analysis result for SHA-256 873d52776f70f292…

MALICIOUS

PDF

70.7 KB Created: 2020-12-26 20:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f4e05520659945fcd6b9eb56d48796 SHA-1: 12c850228af54e6d0f36082c4f0d94d1994845d4 SHA-256: 873d52776f70f2929a3d4e4a897cbd2197d47e5b30cb4e44664224fa1e15f10b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=latent+heat+equation+entropy
    • https://letenotej.weebly.com/uploads/1/3/4/5/134595585/zupezi-ganulixomiv-nisosetaseve-nanufu.pdf
    • https://cdn-cms.f-static.net/uploads/4428341/normal_5fbbb437de47a.pdf
    • https://cdn.sqhk.co/reserujaj/eHhaLyP/77612558233.pdf
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fd309f0319f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gifojuxaxeva/fexizu.pdf
    • https://uploads.strikinglycdn.com/files/f2c07cde-f7fc-49a2-84af-4d09dc0d68c2/bufunonabijavesovuf.pdf
    • https://s3.amazonaws.com/nisiwanolom/vuxogofibelajeginiz.pdf
    • https://uploads.strikinglycdn.com/files/41819265-a038-4499-9425-c3f08c53e966/90211690128.pdf
    • https://s3.amazonaws.com/tesapibebujep/legisonapep.pdf
    • https://s3.amazonaws.com/bisazabe/microsoft_access_for_mac_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d475.bin
1d969fa6f61eda54bca656b195e065d8cb6e7c53117ae7c4e1b692ecee76432f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 4868 bytes
font_01_sfnt_off0000e50b.bin
19b4f98f40a46e0284c3be3303eb8e9cf9350df6fe9270de46b7665b41b9d976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 11844 bytes

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