Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb8034b310bb99b…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 04:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4d05c5b0623677496cd7be5e024e6e86 SHA-1: a51553ea94bebe6e317f4973944d3156b1cf636b SHA-256: beb8034b310bb99b0c31709ea51c6c2454ae68cfb8a59d1e49a76bb8c715cae3
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically `https://dafemum.ru/aws?utm_term=merchant+of+venice+character+analysis+pdf`. This indicates a phishing attempt, likely delivered as an attachment. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the presence of malicious URLs is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://dafemum.ru/aws?utm_term=merchant+of+venice+character+analysis+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_604a956e74ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_5fe9b988d26d1.pdfIn PDF document text
    • https://cdn.sqhk.co/volakase/4bGQegj/wujagobifoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fd322591d5e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_60258a4ddbf8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_60118cb81349f.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/ihhhdhe/run_rabbit_run_2021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_5fe696cc5f697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fd6791c3c1df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5ff20743068a1.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hcjeKxq/dead_man_walking_book_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_60396e5aad29f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5ff7ba3bbc443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_5ff7bb231d3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_60216172356b0.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/cb6f4d68-d4f0-494e-a193-79e2045d15bf/pubajijako.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/bsc_magazine_may_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/gokexedafirutakik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d334b9-27b6-4cc6-8e25-459349a9bf5f/43253785828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96079826-8a59-4930-983c-33772787ccfd/the_warriors_sol_yurick_free.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_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 5408 bytes
SHA-256: 8c0604bf559156631194ac71445c7c9a1815226da2f4e23651342db71cbb831b
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10076 bytes
SHA-256: 0aff4bf56d4bf6e4ce948b7ca113a0bf1065fc580aff0135a4cff85b75c7c593

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