Malicious PDF — malware analysis report

Static analysis result for SHA-256 b720b6c7082a4d4e…

MALICIOUS

PDF

59.5 KB Created: 2020-12-19 16:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4489f68944702639b9313ac5c889b6eb SHA-1: 778edda9b91f849cf7ea1207e6bcf3a2dc654565 SHA-256: b720b6c7082a4d4ed876c164b50478c4a9678ef1c57ca05a7e4ddc72e8df1d6b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ClamAV detection and ML classifier also indicate maliciousness, suggesting the document is designed to lure users to harmful sites. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://traffine.ru/strik?utm_term=longmen+caves+ap+art+history In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5faae519d4e15.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/57a61b657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fa15302c5167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f88a0145cc15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fb8009d7ffce.pdfIn PDF document text
    • https://dudafenerow.weebly.com/uploads/1/3/4/9/134900552/129847f77a2090.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/600b9256-85e3-4a79-8d85-4775d828c345/mexutojed.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5795a7d0c8f249d5fd100/t/5fcad3a50814be4f73dc3a53/1607127973857/50487186189.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3f4a6457125654065f65/1606303563362/lifetime_sport_fisher_angler_10_ft_kayak_with_paddles_90157.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_off0000ae36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE36 5420 bytes
SHA-256: 1f870783530d45bf6c320791c60dffee0ef10248a8c090b42e869e26b9a20161
font_01_sfnt_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 9756 bytes
SHA-256: 5df6356d7752d0de251485ba76f5a8afef0d1fff4bf7aff31ffe5c7c5010b5de

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