Malicious PDF — malware analysis report

Static analysis result for SHA-256 0093a4e87868cb2d…

MALICIOUS

PDF

85.2 KB Created: 2021-03-06 09:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fc69d4c69e8925e2caf0cd310871706b SHA-1: b37ef4a0e727053d4d98c80b521cc3256c601cef SHA-256: 0093a4e87868cb2d205340f186d3222535a6af2b2b54827fe1ab47d91368bef6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 external URIs pointing to disposable hosting and URL shorteners, indicating a likely attempt to distribute malware or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to a 'tuning guide'. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to trick the user into downloading further 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/123?utm_term=multiwii+pid+tuning+guide PDF link annotation
    • https://cdn.sqhk.co/kisereta/nrUgnjb/download_game_mobfish_hunter_mod.pdfIn PDF document text
    • http://risiwivozival.iblogger.org/java_1._7_for_redhat_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/Fgijash/voxegupakatonivekeb.pdfIn PDF document text
    • http://doporujela.iblogger.org/nixukanekopajupixokudeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_5fd87fed6c093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_5fd8b5b9b1fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451563/normal_6042fefc8652b.pdfIn PDF document text
    • https://cdn.sqhk.co/jujirepak/Ajj5Iig/bemibexijogenubinipotasag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/620358dc-f733-41a4-b355-d032d60533a4/lakshmi_ashtottara_lyrics_in_hindi.pdfIn PDF document text
    • http://telewazikenap.rf.gd/vusulefatikezuxixar.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/world_s_biggest_crossword_puzzle_answers.pdfIn PDF document text
    • http://zubikezisupudo.rf.gd/xadedigigetezegunij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76413b52-7188-4f30-841b-8ce31538ff3b/invicta_watches_sold_near_me.pdfIn PDF document text
    • http://vakalugofiw.rf.gd/45902758519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addb77dd-8be3-4982-be43-6844a4c6678d/irobot_roomba_960_oder_980.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/boeing_stock_performance_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e88e92-e3f4-48a7-8cba-2ce9b0eff602/wadurarinigagazaseredu.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_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 4740 bytes
SHA-256: b25f44992f3bed6a8697cec39fda0140f8ddac30918a4a7e1b97395a44c79fb6
font_01_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 11116 bytes
SHA-256: 3d99adeff4a55f38b5e3e29c6377ca5179b8b9b9f95e422a9ce8ef8325244463

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