Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b31d20d260f77cd…

MALICIOUS

PDF

63.0 KB Created: 2020-11-10 07:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3072f9274220b0179ea90481ac841f73 SHA-1: ffbd17201d29d7a535aa478f137b48a5ad4c9dfc SHA-256: 2b31d20d260f77cd9b6943d857778f5991692b288bb8332c1a29e8017d76be49
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with a primary focus on 'traffset.ru', suggesting a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to manipulate search engine results or direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?keyword=autozone+dress+code+website PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458625/normal_5fa7189f29c85.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/lobuzorasuxumupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fa6f9abd154e.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/7654354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5f8e9ea87eeb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f899655e0ff9.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://uploads.strikinglycdn.com/files/bb7d604d-ca4d-44df-abc4-35fec9d4a868/41492897304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332fbc84-dccd-4a9d-9682-c04ff26f18bc/biblia_de_estudio_holman_rvr_1960.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/katalog_kabel_nyaf_jembo.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/best_lint_remover_for_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/rufarulemadafakatodila.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/66114746624.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/solar_adsorption_refrigeration_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d21f80-6dbb-4d75-851a-13f7ddac9ff3/41278820250.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_off0000af20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF20 4844 bytes
SHA-256: 4df4ee04dd10b15a04498a34aa68073243da55a9b2cf81e98a2379fe45b513b9
font_01_sfnt_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 9808 bytes
SHA-256: a8dbeb7f50e687bb626e61b3ed0ffc4972e45db3404fbce401baf1d6697bf29e
font_02_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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