Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a0bc3ae49a50ab…

MALICIOUS

PDF

73.4 KB Created: 2021-01-19 09:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5d509d383951d1317c577c38450b24cc SHA-1: 601cecf11761ff9a22a2cc02b4daeea8903b546b SHA-256: 34a0bc3ae49a50ab972e9adf3475209e077cab5d3129679d5b13821e7c3ebbce
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme to host malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to direct users to potentially harmful external 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://trafftec.ru/123?utm_term=prism+sound+lyra+1+audio+interface PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5ffa4cc31452d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_5fd63430970f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5fa1eef054c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_5fec4091eba57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5fd63a301139b.pdfIn PDF document text
    • https://site-1210486.mozfiles.com/files/1210486/payback_2_game.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/4975716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f91498d8a1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_5f9fe1006525f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5f97ebd07aed7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokofapig/dekixomosiwomixesogu.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/lumejubigewi.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/30969731151.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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 5324 bytes
SHA-256: fc8b377ed4e0975455424c34995dece53d1b3f0bf83b940aad47a41adf44af60
font_01_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 12024 bytes
SHA-256: afa152364e22dcc536976ee44ceb44a6ecefc9110a596258cbfac8ebc535520d

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