Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a00ee99cfc12c9…

MALICIOUS

PDF

98.8 KB Created: 2020-11-25 14:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f6df78fe4bf950d5025e9d9c5a5b1111 SHA-1: bd97191ea780332a733559c90e63c09a6bfcd53f SHA-256: 91a00ee99cfc12c97bc063ed9a1a7b5392b25e1218c1e3d22fa3e24d4f98889d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, characteristic of a link farm, with the primary suspicious URL being traffset.ru. The document body, though heavily obfuscated, appears to contain metadata related to a product review, likely a lure to disguise the malicious intent of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=cyclamatic+power+plus+cx1+electric+mountain+bike+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5faee1f76e19b.pdfIn PDF document text
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/1fab55aaeaf.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/6741250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_5fa38bd369152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5f933b5d787d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fb81a9dd1de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5fb5550de03d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fbe205d6029c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_5fbac7f759837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f9a16fce0e0b.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/324b4200-c494-453a-99a9-3e73f0e2685d/nufoguforunelanemunapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54afd634-9ab3-4044-b564-9a8d77dde6d6/xegajumidogegojojarifam.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_off0001484a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484A 5560 bytes
SHA-256: b2f31d52266cb5591d4199d9ed9663aa269056b394a54d61ce78324c99434256
font_01_sfnt_off00015b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3D 10236 bytes
SHA-256: 217ccf73509ea9a81a304f8c1f434df0442887111719c27217fbab729024b32a

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