Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cb4a620e0b6e2f…

MALICIOUS

PDF

73.7 KB Created: 2020-12-02 09:57:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8ce80a16acf91a2b1695df9d3b0370e4 SHA-1: d5f3c10fe61ded03c957df3a17eb251ea65c842a SHA-256: 14cb4a620e0b6e2fc7a2f40c015597195a1cccd6b1b7090e9c76142db392eda9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'sample problem of elastic and inelastic collision', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=sample+problem+of+elastic+and+inelastic+collision In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fbd1b2dd05e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fbe1e2ce9b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_5fbb117b20e80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_5fb9e01154299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f899ea7b1375.pdfIn PDF document text
    • https://vawirinivilil.weebly.com/uploads/1/3/4/3/134353209/561276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xeloduxubazotesijapu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/lawukezerojulijodopejom.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/21213347690.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51bd18e72e5fdbce585f/1606373821995/83620724084.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_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 5544 bytes
SHA-256: 004576093d7c0a337818b29a548baf3e56da5f8ab90541cf440ff3f5957d8f32
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 11208 bytes
SHA-256: e0b2d9d45df5716fbced0a41b17036ab0ee059e8507b61d2cee0f2789db01b2b

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