Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b385fd4a36fa19…

MALICIOUS

PDF

70.0 KB Created: 2020-11-13 20:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b2f0889990b1254af0f6bd2717bfb173 SHA-1: 14402060bdbe53d813aa0eae192bef1ed9743527 SHA-256: d6b385fd4a36fa19e642b5b81097117645e0d422aa8763d65d80e6ecdb524f0f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafficel.ru/strik?utm_term=guion+boda+civil+informal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fa00cdfc0c00.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/2a299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f9e12084b61a.pdfIn PDF document text
    • https://givovirudodax.weebly.com/uploads/1/3/4/5/134587764/fores.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/winomababu_dovikuz_modufe_velatuwovuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f88b199d0e1e.pdfIn PDF document text
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/b5c59f49af8.pdfIn PDF document text
    • https://runevivapubate.weebly.com/uploads/1/3/4/5/134595370/1420205.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/728f179a-55a4-443b-8945-ba5fd054d76f/tezevofopuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80a6473-2aad-486f-b91a-f1bbab7fbbab/31880152277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36acc5f5-d7b2-4e2d-bec6-661d92fdff25/tebexupifofimete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a86837c-db8a-4747-b36c-51668427d6d1/lefijas.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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 5220 bytes
SHA-256: d4a7dbbe38009285a48ac2d904475bc06250d08c3564d77aba0b779d90c79881
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 9872 bytes
SHA-256: 059a54e38f1e0b3b25297d1eccc757d9e0ad691884720ddcbd37f34b236e1336

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