Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39cf0fe54bfa79…

MALICIOUS

PDF

62.3 KB Created: 2021-02-16 19:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 79ed27284455efcab316e7b90005907b SHA-1: 6dc028ccf63b3f5d23145d14d2d78800c615d599 SHA-256: 9c39cf0fe54bfa79496d1909a7cb7550916f73b2459fd29fe767927f86cdb5f5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to printer support and utilizing UTM parameters, suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery. No scripts were extracted, but the presence of numerous external links and the 'link farm' heuristic point towards a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://seumenha.ru/123?utm_term=hp+officejet+4630+printer+support PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375087/normal_60137e3a6a50f.pdfIn PDF document text
    • https://rojurunonujimos.weebly.com/uploads/1/3/5/3/135325454/rudomalomin.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/ehdiaJa/nations_in_combat_1._3._2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_5fe3db54348aa.pdfIn PDF document text
    • https://vovamujif.weebly.com/uploads/1/3/5/3/135318660/b87f8bbe54cdfab.pdfIn PDF document text
    • https://tunutepefa.weebly.com/uploads/1/3/1/4/131453603/nugimudimisok_muratisipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fe6ccc3a24cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469105/normal_60005c78e5fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5ff79e082856c.pdfIn PDF document text
    • https://tuniforokot.weebly.com/uploads/1/3/2/6/132682883/1038542.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jgigIib/daradanagapeguko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_60214c19f0149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bokelur/good_comments_for_students_report_card.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/82248453105.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/65000114383.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBF 5232 bytes
SHA-256: 2e10c70f6fe660dfc951c46cb598ed4ec5a633c35a478e9dd31efd5ad6766d24
font_01_sfnt_off0000be9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9D 9288 bytes
SHA-256: 82099f2b69edb5cfd1afa53e326f6e2d11a5c871711035e8778b08b0d20bb4e3
font_02_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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