Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56237e6291d8da0…

MALICIOUS

PDF

63.2 KB Created: 2020-11-11 01:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7e07085dad2b1125776a4a6a5b5a2b91 SHA-1: 47e8eec31b58f6af8b5d3352a4054799138c2293 SHA-256: c56237e6291d8da04671576193e5028bbcd7178d8292e19cb4574282a4b6214a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam operation. One of the embedded URIs, "https://traffset.ru/123?keyword=led+traffic+light+bulb", is likely part of this scheme to drive traffic to potentially malicious or deceptive 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/123?keyword=led+traffic+light+bulb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459777/normal_5fa87f3a20c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f9099ebbebf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5f96eb99e7fcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f8e3e073d90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f9bdd4c63826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f87016c4404c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fa1f44513c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f9bcb2bc9ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f8fa227cd335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5f943e5f73d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f88ae471716e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f91e49b6d91b.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/8c9fd2.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/3b273457-a94a-41d2-a45b-0e9079fe1ccd/poesia_acustica_2_letra.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_off0000b8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EF 5184 bytes
SHA-256: 2ce21f4196555aaf2a65fcba60a3922b02408f54019dbfcaaa1453fe16d8a084
font_01_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 11092 bytes
SHA-256: 262951de1f9cf1be2c6ff232507049c75c1597b12179134d3a257fc54f7f3b20

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