Malicious PDF — malware analysis report

Static analysis result for SHA-256 3991557d2cb06483…

MALICIOUS

PDF

89.7 KB Created: 2020-12-24 05:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 234016efeb10c09b49ad231d2d42165f SHA-1: 287e93bb40e029614a50f784adc834463963ee7d SHA-256: 3991557d2cb064830769c52d1fcf10b0cec0f5024a7884b1d5437f235959a4a2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9187

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cctraff.ru/strik?utm_term=pirates+of+the+caribbean+2021 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_5fc2299d0add8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_5fbf535e1aa70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fc11f3878fc0.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/fetuxoxajuxosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f88083edff02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5faaee6e713da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fd1c3818d6f9.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/nutolonexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fd68c26397f4.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/1e8c1eb1-9d5f-41ba-ae44-cb394317767a/jamestown_dbq_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/50981139352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a64a172-0b5c-48df-aa77-21d5ec49bbc7/bdo_bartali_adventure_journal_guide.pdfIn 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_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 5404 bytes
SHA-256: b0fc3ca3cc5e78c155c456b7b0454a3020d3dc627c85218243d7980e1a223e3b
font_01_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 12768 bytes
SHA-256: 5289d98ca9699320c218c8bbda4becdf29ccea5a7ef915d0b26e87f0f2add0c8

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