Malicious PDF — malware analysis report

Static analysis result for SHA-256 754e451582808d1a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-09 09:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2888416907c220ce3c07bf4c1c15236 SHA-1: feac955a25cba81c491c5068a2a2ad5537857c15 SHA-256: 754e451582808d1a7ac094432b09b513dda315a9e45aaaf65a1a08174aa8a9d8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=what+are+the+main+types+of+database+software
    • http://namabal.scienceontheweb.net/activate_b2_student_s_book.pdf
    • http://mebel-albero.ru/30499524908h85jh.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/liguzap_jobemubelewine_dagidoneminotu.pdf
    • http://help-copyrighteamservice.com/petufadsxyz.pdf
    • http://zigijel.22web.org/diary_of_wimpy_kid_rodrick_rules_soundtrack.pdf
    • http://obuv-kozha.ru/dream_meanings_baby_drowningu1ij4.pdf
    • http://hotita.space/zaleduzumoxeferib9c07.pdf
    • http://jesiwufap.iblogger.org/bu_admission_result_2018_19.pdf
    • http://skout.tech/diabetic_foot_ulcer_guideline_malaysia2zs5q.pdf
    • http://ductsunlimitedins.com/pifaned2v9vw.pdf
    • https://xukujeferok.weebly.com/uploads/1/3/4/4/134435440/17e678c8e.pdf
    • http://naykaryadom.fun/kaveraxuvolikekamalujaltjz.pdf
    • https://luzozesojuximu.weebly.com/uploads/1/3/5/3/135321468/vizenizojovoju.pdf
    • https://vebudizegegogog.weebly.com/uploads/1/3/1/3/131398423/bopafo.pdf
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/vorol_wagotulunexobof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tanadumowijilum.rf.gd/60172459298.pdf
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_8a0e284e673745c9893562cdf263b3ea.pdf?index=true
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_623e5a537af94fe8a9926c954abb0c12.pdf?index=true
    • http://poziluxolebulu.epizy.com/foporasirilivam.pdf
    • http://xamukipadu.myartsonline.com/balistica_forense_gratis.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_off0000f92d.bin
9da45c14ac627b450bb67bd615ba68b32986d3692e87827c26955e8af96735b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5596 bytes
font_01_sfnt_off00010c1f.bin
8d871474abd0c36adccf6ec514dc897feaeaeccab03c2f7d672095702d124c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 10788 bytes

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