Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0869ca4a6402674…

MALICIOUS

PDF

62.5 KB Created: 2020-11-11 19:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 790a08cfa902bc0a6c998e320028dd6c SHA-1: 919dc2e3eb140e02eacf5294ebe4b6a90af3bf8e SHA-256: c0869ca4a6402674c231d9656df3a7e51132a4bbe31a8138b00326273564563a
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 0.9995

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://trafffe.ru/strik?utm_term=pioneer+deh-+2200ub+wiring+diagram PDF link annotation
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/xijakoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5fa60772a49bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_5f9ba9b31f80e.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/zokokamu/17731101728.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/tatelopefobob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3642f19-7d57-4a28-b0a3-8dd034268767/plants_vs_zombies_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/guitarists_like_joe_pass.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/off_sides_by_swyer_bennett_read_vor_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3cdd7c-2e1e-42eb-9f99-5f426048123d/wodar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92627ef-dca0-471e-b124-c34f889259af/6263354170.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 5568 bytes
SHA-256: 65d37b9468d956338bf290d5866d3ab84abe7e9f9fdfcdd89c64e782bd701311
font_01_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 10352 bytes
SHA-256: af9e52cf5a4f670d87e7d18850afacc8c5b4e6e71d92de18fc53b109587bf0a5