Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c298b2da855985…

MALICIOUS

PDF

65.3 KB Created: 2020-11-13 11:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce188057f8df49108de044455a41d84 SHA-1: 1b16568c1fdf1fe78584ee20fef7bfcf29630c72 SHA-256: 10c298b2da8559858556aaace9d4e2585a0ce30ee1a2719d601497c64371e033
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the presence of external links and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to potentially malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=effective+leadership+and+management+in+nursing+pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5f9e435e93b96.pdf
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f874be646a8f.pdf
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/248231.pdf
    • https://cdn-cms.f-static.net/uploads/4475580/normal_5fab725609636.pdf
    • https://cdn-cms.f-static.net/uploads/4403960/normal_5f9544934d29f.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fa456f939fca.pdf
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/wixinidigaruzaz.pdf
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fa4eded0c48d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39981833-65d5-4d01-b05f-4a77a42398d2/97051873536.pdf
    • https://s3.amazonaws.com/falufusu/deloj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c136.bin
6d041f9f97307450a545fa012448d5ec3b6778ba9579bedb7b79941882d2349a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 5588 bytes
font_01_sfnt_off0000d41d.bin
e0d419823e9eb20518af489e4320e77c1249aafde6a41456891253e8be2ba7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 10700 bytes

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