Malicious PDF — malware analysis report

Static analysis result for SHA-256 4307f93c8f255fcd…

MALICIOUS

PDF

74.4 KB Created: 2021-02-12 17:58:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a90cce5b4a177f13569fc31fbb35e78 SHA-1: 7878786ead768a806c62e668bea1a5a04891c5f1 SHA-256: 4307f93c8f255fcd684d64bcd5859e099ded47a9ad0d9892cccd45323167a64d
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for distributing 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://seumenha.ru/wix?keyword=royal+doulton+toby+jugs+price+list PDF link annotation
    • http://unonatur.space/dr._mario_world_redrawn_rom7zzpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_601c87d383dff.pdfIn PDF document text
    • http://com-copyrighit.com/46903029480pyjow.pdfIn PDF document text
    • http://mainsale.info/dunogilakisikoxovoziselizfo9f.pdfIn PDF document text
    • http://pabazumakubonok.66ghz.com/hard_boiled_egg_no_yolk_nutrition_information.pdfIn PDF document text
    • http://harkateine.fun/jidakux4kfo3.pdfIn PDF document text
    • http://nominasacra.ru/3560565361376f9h.pdfIn PDF document text
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/63973188f9.pdfIn PDF document text
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/pugivanewukimorij.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/FzhamW2/pinout_diagram_of_not_gate.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/jcrhdgc/fill_in_3d_apps.pdfIn PDF document text
    • http://songkfrk.site/vujukigajawamenuwadwqc9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_6023fa6705f3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapugiv.rf.gd/84335485314.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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 5564 bytes
SHA-256: 2f1723e37a1abfb47f438a2a2c7248c376719b53e69ffeee93dfa43263528ba9
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 13432 bytes
SHA-256: fdda13aa89e4dd0632400cf1c9f6e3189556b8776fbdae5e06d48a8edbac06ac

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