Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8adcb134b3d2ec6…

MALICIOUS

PDF

76.7 KB Created: 2020-12-24 10:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be359cac94acaccd2aa634c7caf1414a SHA-1: 1566e74f126b46be8d1a3a14f1bbd2ce50577aa8 SHA-256: a8adcb134b3d2ec6cfb91477e66e9273ad86aa7f12856169e48abf268a310dac
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=the+adventures+of+sharkboy+and+lavagirl+3d+2005
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f960dca14a95.pdf
    • https://cdn.sqhk.co/zowesifona/hchyjgW/72925607647.pdf
    • https://mozalotajevel.weebly.com/uploads/1/3/2/6/132682758/8ef2880f578.pdf
    • https://cdn.sqhk.co/zolaxadivowe/idnYmjg/wedding_salon_dash_bridal_shop_simulator_games.pdf
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9d046e87ee4.pdf
    • https://kololopobiro.weebly.com/uploads/1/3/4/8/134853362/gamoxixulujopi_panome_dojatomadal.pdf
    • https://cdn-cms.f-static.net/uploads/4480582/normal_5fd8d28e07970.pdf
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fc7f84b70449.pdf
    • https://cdn.sqhk.co/xizowabik/qiaujaf/ruvojojobimogoxesapoloj.pdf
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/48441f22.pdf
    • https://cdn.sqhk.co/guletema/jcii5hd/shark_bite_drink_with_vodka.pdf
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5fa0918fd5063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/721d532d-b504-4120-bfd5-eb0967478ccc/joxati.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e963.bin
91d5b56e401812d58d0561a3c671ae91d22fb6118c324418fc4353b085294a86
pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 6048 bytes
font_01_sfnt_off0000fe05.bin
e2933e0fda1ed49527a45f80d043c7f868732525bb9f5156d07339942da16c0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 11976 bytes