Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75cd1749f9b3841…

MALICIOUS

PDF

75.7 KB Created: 2020-12-17 04:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4c2cb829bc3c846059fd543a6891c1f0 SHA-1: 187047aef88d1740816cbdd47a70cf395140ff1a SHA-256: c75cd1749f9b3841a30ed10664b875a4e5a8c766cce9929e3ea8648ad8a6df86
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. An external URI pointing to 'trafficel.ru' was extracted, which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=grange+hall+elementary+teachers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499629/normal_5fb6aec44fd79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_5fa86a5aabf80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f9be65436710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f9c3c361e550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f9781f3b58d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fc1ad70a0861.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd040e6a371610b87864b4/1606222865606/land_of_the_silver_birch_lyrics_racist.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1ef8507f735bdd7482f4/1606229755454/nightmare_before_christmas_ring_holder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c402786-91ce-479a-8cee-be7e78ecd930/lidukufifoxagafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9183147c-e950-47bd-8a28-922a9a8b28e9/fuvitibiloji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9646218e-7f7c-4f3a-81cc-505611fbd8f6/thank_you_korean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af58c08-973c-4dcb-b1bb-6e703f2aec81/dixafizamivil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f346023-ed9f-49dc-a081-00cad9f5cc25/9906711983.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5344 bytes
SHA-256: dfd487d6545a0a93bef617e895c8a6e8e7e057fe13211dc2c5b1bbcc288abf89
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 10716 bytes
SHA-256: a0608e992004eacee0a84c23835fa49406b61a93bb2a70cf226acbe142c5b448

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