Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72155f66399d72…

MALICIOUS

PDF

58.4 KB Created: 2021-01-17 12:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 23ebf535da8c0304af93757bba1b275b SHA-1: d1be1dbefbf2955d074500cdd84b0aaccd70bc35 SHA-256: bc72155f66399d72b9b7f89bf50436bf4e6db87fd013f751aa0d12a7b66133de
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI pointing to 'traffine.ru'. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8144

Heuristics 3

  • 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
  • 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://traffine.ru/aws?utm_term=handwriting+practice+sheets+letter+t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447276/normal_5fba02b95903d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5ff922ee59e58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5fe5f9dd07d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_5fbb1860b1bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_5faece8297d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fb5e649bc862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff9dacd01d72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5ffc1cede65a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5fa70cee782fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ff0d1a3a1749.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/eN0ejhi/fokogoxunux.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/lorifumofelu/flower_parts_diagram_worksheet.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 5064 bytes
SHA-256: 892eb9d722c9a4b8cff3641c56e943966d3679495222f9a88b09a7e72c11f0de

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