Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fd2eb1ca93905f…

MALICIOUS

PDF

93.9 KB Created: 2020-11-13 20:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edf0702ecaee0a12c2813e9447291aa0 SHA-1: 97cc4cbd44151db0bc62d45f715f2bc68e8ab27d SHA-256: 89fd2eb1ca93905f46309c80e601c69c7a1d201c96aa2d5bf8af1ba5efe8cbe5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to 'traffset.ru', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=star+wars+last+supper+poster
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f8beaa879d19.pdf
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5f970b311a21b.pdf
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5fa25100c0f1a.pdf
    • https://cdn-cms.f-static.net/uploads/4413575/normal_5f98a2b2b772f.pdf
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5fa05715bb8c5.pdf
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/simasijux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65f37293-efb6-4595-8241-9d60079519bc/30705481311.pdf
    • https://uploads.strikinglycdn.com/files/bfd69f73-95ad-4d2e-8094-48175e816669/99588978931.pdf
    • https://uploads.strikinglycdn.com/files/acc9370b-39d7-4416-8a39-2c3913b9d00f/zudoxupisogilerikifuwexu.pdf
    • https://uploads.strikinglycdn.com/files/05c6ba0a-0425-4e58-8edd-ffccafc6ecca/61619072333.pdf
    • https://uploads.strikinglycdn.com/files/c5d22874-c542-45b4-af26-d91ffb9d223c/94789085651.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_off000132f0.bin
99a45c2793e2a57a21a1a64297990348366fac7d9aa27961e60532333b5fd8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 5008 bytes
font_01_sfnt_off00014417.bin
7195fcbd3298d04a56f4cc8902c58529a4ace0e0754c123d4eaa503e8e105181
pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 12132 bytes