Malicious PDF — malware analysis report

Static analysis result for SHA-256 f153b3d4dce76d34…

MALICIOUS

PDF

77.8 KB Created: 2021-01-21 11:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0af8ab9fd952704c3afee45ee727b28a SHA-1: d388af849da8385b37e90d4031d1ba3f13228580 SHA-256: f153b3d4dce76d34ae2a42348e0668f6f7a7fc401331d7cb919cda11d50e7895
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=swimming+games+unblocked PDF link annotation
    • https://saxenivimagi.weebly.com/uploads/1/3/0/8/130813604/2587619.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/gddghhe/zombie_blaster_shotgun_shells.pdfIn PDF document text
    • https://wujadagepixiv.weebly.com/uploads/1/3/1/8/131856877/setosevogerilo.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/504ed200989ec1.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/hidicjn/my_little_princess_fairy_forest_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/vhe8NGc/share_it_web_app_download.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/7423005.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/H8geE5w/electrical_system_design_calculation.pdfIn PDF document text
    • http://bujufamamaw.22web.org/14051749312.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/wajapetoli-paner-meledudupu.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/whb9fib/kung_fury_street_rage_ps4.pdfIn PDF document text
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/ce1e810414b.pdfIn PDF document text
    • https://tolorojefa.weebly.com/uploads/1/3/2/6/132681575/lemivakunivusep.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/774d93c7.pdfIn PDF document text
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/9683525.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/bhgVOhe/pujewuw.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/ruvunupibebov.pdfIn PDF document text
    • https://cdn.sqhk.co/rilaraviror/MLhiiaj/download_reina_theme_park_tycoon.pdfIn PDF document text
    • https://rofupujo.weebly.com/uploads/1/3/4/3/134335987/64a93ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 5564 bytes
SHA-256: 02dea475c353f8d8c17778787ddf9487bb55f96173e2ac4c4033612e89b11431
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 10456 bytes
SHA-256: dd95d9422b1ec9dc764b37d1f0d60ed4fce8f4873fee85ab3a2ce596c9483fca

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