Malicious PDF — malware analysis report

Static analysis result for SHA-256 84473b097a67be6b…

MALICIOUS

PDF

84.6 KB Created: 2020-12-31 17:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a97b0e134de0416930041f87d580955a SHA-1: d5787cfb3bcf4b4f2f7b602fc59d53fa07ff6d7f SHA-256: 84473b097a67be6b6c55c69f9600c8d46a2f865bb184a8218a8dbf21c32c1f1f
242 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting link farms. The ML classifier and ClamAV detection 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 0.9260

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=spotlight+room+escape+level+3+puzzle In PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/putalazaradazuwozus.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/cd73e50.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/5c9b388b904e.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/vopejojowitezakew.pdfIn PDF document text
    • https://fapifejoj.weebly.com/uploads/1/3/4/2/134265577/3941052.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/hAWEia4/34255639369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5fdc8052039a0.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/a2700fda-14f8-4dc4-8b5b-d871abbd0a8b/nexabakelewavudetesibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c36a08-37d9-4d83-bc19-ab08694028d2/pamuvavege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd69c01-8c7d-42e7-9872-cf2650025140/68515366214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feb8e92-9d00-4fae-a43c-84c0b89e5543/geometry_unit_2_parallel_lines_and_transversals_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e9609-fd08-4868-ae3c-d3dcd6e6d653/jamunuxutaramexosukifozog.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_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 5724 bytes
SHA-256: 99f5fce64892610eeebe1c2bb3b129cbb9b332c7563f404920c73a8cb8bdf2f3

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