Malicious PDF — malware analysis report

Static analysis result for SHA-256 249bf50c9a2d804c…

MALICIOUS

PDF

72.0 KB Created: 2021-03-29 00:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d03f09d00373cd15f1ee2f378c1ef5e SHA-1: d4babf68bedfd7de74b813cdcda16e739a41583d SHA-256: 249bf50c9a2d804c298a4249df242158063644ebbfa3b6a04017686ec95a9067
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, which is characteristic of a link farm used to obscure the final malicious destination. The primary IOC is the URL https://nipisod.ru/strik?utm_term=genie+acsd1g+remote, which is likely the initial lure.

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://nipisod.ru/strik?utm_term=genie+acsd1g+remote
    • https://static.s123-cdn-static.com/uploads/4416500/normal_6007a77867e49.pdf
    • https://static.s123-cdn-static.com/uploads/4476446/normal_600768f90ce3d.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/numoru.pdf
    • https://cdn-cms.f-static.net/uploads/4471969/normal_600deaa046a10.pdf
    • https://jijejadu.weebly.com/uploads/1/3/2/6/132683218/5348001.pdf
    • https://lewovabarififu.weebly.com/uploads/1/3/1/4/131453312/7148068.pdf
    • https://rogasiwenebagan.weebly.com/uploads/1/3/1/3/131380029/3bfad2.pdf
    • https://cdn.sqhk.co/tenalewi/DwhhhcN/fallin_lyrics_grandson.pdf
    • https://viduturuv.weebly.com/uploads/1/3/6/0/136082320/fuwaselufili_miwipadiwa_xopusoduwowo_bulanujifolavir.pdf
    • http://dokovuxumev.22web.org/how_do_you_administer_medication_through_a_feeding_tube.pdf
    • https://cdn.sqhk.co/raserijene/nmdgcxt/lips_fine_art_printing_services_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4477409/normal_604ad3c273391.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/473442a7-15fe-49dc-b0fb-2814338dbc4e/21630818698.pdf
    • http://fekiboxupikus.epizy.com/appassionata_secret_garden.pdf
    • https://uploads.strikinglycdn.com/files/57dbdd72-3af4-41f7-958c-b83b7a5fc988/how_to_improve_career_software_engineer.pdf
    • https://s3.amazonaws.com/lawakux/project_findings_report_template.pdf
    • https://uploads.strikinglycdn.com/files/bf3c7588-1331-4abe-927d-fbedb7da6f5e/38664032181.pdf
    • https://s3.amazonaws.com/sabegokek/56935588893.pdf
    • https://uploads.strikinglycdn.com/files/83ca694b-7209-4496-85b0-e677ea156c72/what_are_some_debate_topics_for_middle_school.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_off0000dd06.bin
03ab39c48cf6eb19b44583d6654526c08843b40f9b8696cdb8ee620af2349475		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 5312 bytes
font_01_sfnt_off0000ef09.bin
ac6f46a2e8cd9f3a0109fc7ed996812b126905fa112a3f77a6d07a1a1fc08608		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 10560 bytes

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