Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b775faf861032d…

MALICIOUS

PDF

131.8 KB Created: 2021-02-24 22:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a0ff67d46b8abbbead57a86ba2c67683 SHA-1: c8bb0540343c3b0dfdfdcf29f7aa21c15f0a267f SHA-256: 41b775faf861032dd045bb1ad80b2da01f1f5cb138f3373e5e314ffc4e15856f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm directing users to external URLs. The presence of numerous embedded URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution scheme. 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 0.9999

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://maypoin.ru/award?keyword=asus+z97-a+m.2+sata PDF link annotation
    • http://lololoj.sportsontheweb.net/25220842717.pdfIn PDF document text
    • http://ericksandoval.com/total_gym_1100_exercisesi8lik.pdfIn PDF document text
    • http://nesobaka3.xyz/6745524274y958q.pdfIn PDF document text
    • http://pujuburebofig.iblogger.org/migal.pdfIn PDF document text
    • http://libralab.digital/sunatigovx7sq.pdfIn PDF document text
    • http://fruitik.space/28357992596brhwd.pdfIn PDF document text
    • http://tikovg.xyz/95134132166yxc3q.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/97298998299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roteniju.rf.gd/lofizugimitumoligigaze.pdfIn PDF document text
    • http://suvokejixu.epizy.com/top_interview_questions_on_java.pdfIn PDF document text
    • http://zokivobadid.rf.gd/vekerananametewutu.pdfIn PDF document text
    • http://mirijevedot.epizy.com/punuluzifikekefelikano.pdfIn PDF document text
    • http://nimozan.epizy.com/ill_guided_definition.pdfIn PDF document text
    • http://kurujabarufuxe.rf.gd/56843561455.pdfIn PDF document text
    • http://nipalarinab.epizy.com/spectre_performance_air_intake_system_review.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/watetujugixesin.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_off0001c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1A5 5172 bytes
SHA-256: 80aee8fe57ebad656393d02d750f8a075300656d64bf1a412129bfc130b3ca3b
font_01_sfnt_off0001d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D345 14860 bytes
SHA-256: 5f653d7a27ceff4fd643dd53f039655b6a73c9e12d18c49e379fda7616c13287

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