Malicious PDF — malware analysis report

Static analysis result for SHA-256 39eadafe951cbdd1…

MALICIOUS

PDF

71.5 KB Created: 2020-11-19 15:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 93f886e6af5457925a0e0385e165bff7 SHA-1: ec8cf3bff6c3d896b8c77d2eb9e9214c116b4e46 SHA-256: 39eadafe951cbdd1cdb3de5c63e4919a0a0dce48cc35e974cf9d2fa58e69ca87
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/aws?utm_term=chrome+music+lab+song+maker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fb5c7277d8fa.pdfIn PDF document text
    • https://povelelowu.weebly.com/uploads/1/3/4/3/134331265/6476884.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/setozaxozifirofan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5fafbdb9e459b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8a18a525a4e.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/098659e5887e723.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/kimoweworape/xitixutekonasipitobew.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/munidalozenifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58442266-bab2-4a51-8d70-99e7f3283050/76082376204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26e6a32-9a5e-464d-bb62-1896ce239ab1/22576840905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dfd6d2f-d14f-4ca6-aef5-951cce17d09b/65983138641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9b145b-9f32-45e6-9114-8d6e8af5ec81/43415699540.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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 5320 bytes
SHA-256: dd8b41991048ac961ae5a4e031aef0d1ed7f5283f335727b20e36dcc6ac71c58
font_01_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 11152 bytes
SHA-256: d7a60b53fc4632d0ed8bb6e2d01b5d2d1fb29d904a17252c77a715d77ba70b44