Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd7e7d55481f461…

MALICIOUS

PDF

62.2 KB Created: 2020-12-17 22:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf86259fdb1fed99001fd4a96ed4c62d SHA-1: d52ae874dd815978cf21ddc901bcabf7609c26e5 SHA-256: 6cd7e7d55481f46151b799bb969eca3b67f64e8168606dd049e247c805dd78f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains a large number of external links, including one to 'traffking.ru', suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to drive traffic to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=kiss+the+cook+kill+the+wife+apron
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5f90a0f41afd9.pdf
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/dapuvema-lukasuleb-zowovo-potevibi.pdf
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5fb99234bc330.pdf
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5fbf0b1f411b1.pdf
    • https://cdn-cms.f-static.net/uploads/4478422/normal_5fa5b324d7cc3.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fd3a64048d6a.pdf
    • https://cdn-cms.f-static.net/uploads/4471240/normal_5fbb4b09094d7.pdf
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fca36f37941b.pdf
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fa27d7bb7389.pdf
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fb4bd6f61c18.pdf
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/8298134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdff51645712565400796a/1606287185518/kenra_platinum_blow_dry_spray_ingredients.pdf
    • https://s3.amazonaws.com/mokavilez/furafiliwuxepodupexazina.pdf
    • https://static1.squarespace.com/static/5fc0c66b27a199023ab4af32/t/5fc1f0032dd96f5918346103/1606545412596/1967_ford_galaxie_500.pdf
    • https://s3.amazonaws.com/sefipa/68522790419.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_off0000b69c.bin
e712e84c068cd616b63dac48a7e4f548f66945e04199797f7c1852c693d69d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 5228 bytes
font_01_sfnt_off0000c879.bin
72be6ab87dda7e46537976695f5a5f3ae7584acbc74a69475568356d577c0c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 10584 bytes