Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc96128d05cbec…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 05:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a81449b44836f94afd846529ba58bf30 SHA-1: 4315e846a46a773b6603918c3f2a6957b3e8db42 SHA-256: 7dfc96128d05cbecc69da301e28216629ce068e0e62bf9bd5e43ebcfe84b6aa8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL, 'https://nipisod.ru/strik?utm_term=can+you+play+2+player+on+diablo+3+ps4', appears to be a lure disguised as a search result to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=can+you+play+2+player+on+diablo+3+ps4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fc87faa271cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_6056852be5612.pdfIn PDF document text
    • http://ledimpress.biz/hard_bass_dj_song_mp4apfhe.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/42955633860.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/livro_bambuterapia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_605a71cda6d1e.pdfIn PDF document text
    • http://todayit.pro/nesufapojavosiwemesivinu3dbzu.pdfIn PDF document text
    • http://profaudit32.ru/howls_moving_castle_full_movie_free_englishxlqag.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/58677627832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_605833b2e5a58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60118a91d2cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_600ac08dc55ab.pdfIn PDF document text
    • http://leyloften.online/amplificador_de_potencia_clase_ab5gzdy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_e0df2261b40a4b5e833637eb0311684e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06fd0ae-b34e-4704-9a5b-c594171df047/86427576439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98a9fbc-4b76-42e4-aa29-32bade8a76a1/dusawulanujiserenesono.pdfIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_7c941ce3df1c4cdc89ad0cafe676744a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdd4f83-c781-4d0a-962d-ab61b13d4924/34639258579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0487d66-79b8-4ef5-8ae8-b3b87a169fc3/how_is_julius_caesar_assassinated.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_8b2de461625f4fcf90e4fbe297e8cd20.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_55b850abd36f45359047644f4ba340f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ed7e40-acff-49aa-9bcb-e2b4e834bdf7/41861384450.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_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 5484 bytes
SHA-256: ba47c2d74bb3fd7306b382cec7ad867e56c83bfbd9f7173acfee992dc6fe87bb
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 11268 bytes
SHA-256: 2955a4e722e8fcb61ede00dd7128a45b941c475e7639904f3515f8973cd2f1b8

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