Malicious PDF — malware analysis report

Static analysis result for SHA-256 c853b038e5c711d9…

MALICIOUS

PDF

65.6 KB Created: 2020-11-19 02:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 679c2c40ed3f8a30303cc9d17a78911e SHA-1: d98efdf2bf8f103ea54cc0c4e34fe377c34f0697 SHA-256: c853b038e5c711d93fe0260544f6260c36d1b6196350330a5bd6a7c72bd0eab4
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 0.9979

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://trafffi.ru/strik?utm_term=tiny+music+box+bloodborne PDF link annotation
    • https://rulozakowix.weebly.com/uploads/1/3/4/7/134730123/ddf33869dc85f.pdfIn PDF document text
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/xesukavejevoref-mejuxitomi-gegoxumidowobop-rifuxazusitami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fa891c4204f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10ac26e-816c-4498-a00c-4d7b3a68cb1a/kekel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef04d34-4907-48b6-a73e-c527e91885b2/lemositoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0902e6d9-fdd7-4ec3-9c3b-40b5ec82425d/26581919913.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/lowiwinolas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849b612e-d383-4029-9de3-ef7ffa730a85/who_is_your_brother_in_laws_cousin_to_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54625680-8ef2-490c-a5f3-c83cf5a255cb/4750404515.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_off0000c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC854 5132 bytes
SHA-256: 3d464da20f2660ba4e755f540eed8a40531236c0e5b6b88c81e72589c0d48ef6
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 9544 bytes
SHA-256: 80e89421534f994fc40e9638d158429cab2d4bcdfa51a1d60acf63b1c8b68336