Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b9f6f1cb6a2b97…

MALICIOUS

PDF

71.3 KB Created: 2021-02-16 08:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112d1801b024e4c18133d3fe3feb4cef SHA-1: 08f8b109d4963d1dba53d1311a7a67aad08cd1cd SHA-256: b9b9f6f1cb6a2b979c40eb0b7b769611b3353fd77c5f88e6457fa85dd0f814cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as search results, a common tactic for SEO spam and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

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://seumenha.ru/wix?keyword=super+mario+sunshine+64+rom+hack
    • https://cdn.sqhk.co/kukisigafumi/VIEifjf/battlefield_4_commander_android.pdf
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/9654682.pdf
    • https://cdn.sqhk.co/kixowijeka/XXlhamF/subway_princess_surf_endless_runner.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/tekamuki_megikasego_nevido_fapavuw.pdf
    • https://cdn.sqhk.co/daxerarugak/7gfAjaG/vuwepajep.pdf
    • https://cdn.sqhk.co/ratugetaj/jfjfiaw/31310845828.pdf
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/vupawepiwunud.pdf
    • http://pomirkapa.site/csp_reflective_practice_template2ebm5.pdf
    • https://cdn-cms.f-static.net/uploads/4383702/normal_600ef4fc71d42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jasadavebaga/nogabemulenosusivug.pdf
    • https://s3.amazonaws.com/wegugus/rodikejowixu.pdf
    • https://s3.amazonaws.com/midizaxopazeji/najubumegejusawume.pdf
    • https://s3.amazonaws.com/tomaxade/zukufanobek.pdf
    • https://s3.amazonaws.com/nokiva/english_weekly_lesson_plan_template.pdf
    • https://s3.amazonaws.com/falufusu/49016638401.pdf
    • https://s3.amazonaws.com/gasodamuza/75698648200.pdf
    • https://s3.amazonaws.com/purixifusipelid/zaxepotok.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_off0000d7d5.bin
c87ada16682ab36b3bdd7b0113ded00a4ff9ee05f29086fced4ba81b6ae157f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 5552 bytes
font_01_sfnt_off0000ea89.bin
660dcfc275cf3f55843d57fd5aebf43e7e9ac05fd678eff567a825d0074afa07
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 11076 bytes