Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef9b072fc9a378e…

MALICIOUS

PDF

80.1 KB Created: 2021-01-08 15:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9ac3db34528911ff45fe1eb366620834 SHA-1: 9cfc92292a269528b880815c137ff16dc4b672ef SHA-256: bef9b072fc9a378e65f493faac98ad7661fbe8b202cba0987d7e84940efc8f72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation scheme. One of the embedded URLs, https://traffset.ru/aws?utm_term=the+structure+of+crystalline+solids+pdf, appears to be a primary entry point into this network of links. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it may be used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffset.ru/aws?utm_term=the+structure+of+crystalline+solids+pdf PDF link annotation
    • https://cdn.sqhk.co/jozojijejip/FYIjjKE/70619026014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5fbd95b187deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8db241ce6f9.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/mukodunub.pdfIn PDF document text
    • https://cdn.sqhk.co/soletibedix/IJyhefJ/dibuteli.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/38fba30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f9c2d7a41558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5fcb33d824155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5fc8785fb5eb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5fe2d9c64be71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5f9c7c9cd100b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f9042c4149fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 5296 bytes
SHA-256: 8b5fcafe0777bb7d49c8830fc9c3b4eea0cddcddbb36295035e13f61a01cc0a7
font_01_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 11716 bytes
SHA-256: c9021673ef233e75dc404b816b761bb7b0675a196ebb2f8bdcde9c92a7c60014

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