Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea85701cba3402…

MALICIOUS

PDF

77.3 KB Created: 2021-04-26 22:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e53dad97626611e56cff354eb90e90 SHA-1: b0bb060c330fa5be96eb327931319581ef63fb95 SHA-256: fcea85701cba34028e21c78170d1071926c7e9ca5b196a04c32799b1004c7615
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The presence of numerous external links, some on disposable hosting, further supports the classification as a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=lord+of+flies+sparknotes+chapter+3
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/b634b27ee24f4.pdf
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5fefe8f40f2fb.pdf
    • https://cdn.sqhk.co/jizuxadif/4jbYieI/pictoword_level_55.pdf
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/1304199.pdf
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5fde575deb719.pdf
    • https://static.s123-cdn-static.com/uploads/4476590/normal_5ff680f6d85db.pdf
    • https://cdn-cms.f-static.net/uploads/4500893/normal_6046a4b6a03a3.pdf
    • https://cdn.sqhk.co/nusipodagunu/xjeRYhb/vaxef.pdf
    • https://cdn.sqhk.co/dimowitop/bhccieq/53646522203.pdf
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/3fa4be0609e0037.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a226ecd-3de4-44bf-a2ac-73949145a954/fosetabulegodugavepux.pdf
    • https://uploads.strikinglycdn.com/files/d0bc4afb-267a-4471-9d35-1c1ad850a711/why_do_my_legs_hurt_at_night_during_pregnancy.pdf
    • https://s3.amazonaws.com/bisegilupuf/hp_laserjet_p2035n_toner_compatible.pdf
    • http://lafagelupuf.myartsonline.com/mozewosazusevajotolakad.pdf
    • http://sokekakeloji.onlinewebshop.net/brave_new_world_review.pdf
    • https://s3.amazonaws.com/xisefowu/crayon_coloring_template.pdf
    • https://s3.amazonaws.com/dubiditiginowo/56112638512.pdf
    • https://uploads.strikinglycdn.com/files/355479ef-bf12-4e68-bc62-2468591be8ac/24360668245.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_off0000f0c2.bin
1a6ed312b7160931b86f3ddb7afd927015408f502c10534295a956cd7612b58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 5412 bytes
font_01_sfnt_off0001032c.bin
ab30839b4837eec1cd37166f9f172af2ff3264c64f845b04be7b481bbcd5496e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 10220 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.