Malicious PDF — malware analysis report

Static analysis result for SHA-256 95725cd8e218fd03…

MALICIOUS

PDF

77.0 KB Created: 2020-12-15 19:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5ba70ccd349757a8eed39df95a7b0ead SHA-1: 94b36e8c18a2477ab9aef7853919ac34239839ca SHA-256: 95725cd8e218fd0372fea8702d2751970adee5a2896fa4bae2a549e4221f98cc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO spam campaign. The primary URL, 'https://trafffi.ru/aws?utm_term=formal+apology+letter+for+missing+a+meeting', indicates a lure related to meeting apologies, likely to drive traffic or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=formal+apology+letter+for+missing+a+meeting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408333/normal_5f9c809d292aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5fa3ae9aa7c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fceb7759a0cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_5fb6b0117d721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fadc6106d335.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/6182670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5fd6c5b3ac44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5fa8e51648756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5fa16a3acb428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5fb935a02c541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_5f9e2fbd3cee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5fc27e5c16b24.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/007caacd-93ce-4155-a253-4daef7dcaf50/aabb_technical_manual_2008.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_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5276 bytes
SHA-256: d17f25c4bacf850035b171b90f09e68bdfcb56186ed503c8fc3a9e844cfb9ebb
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 10540 bytes
SHA-256: 46ff86983ddced75b35b1ec678fe7bd8abbbb319b885b96ddcf756f652808449

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