Malicious PDF — malware analysis report

Static analysis result for SHA-256 4582c2d593ffbc0e…

MALICIOUS

PDF

79.7 KB Created: 2021-04-11 07:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55c41decbbdc5dead16cf74678b790eb SHA-1: 677997dce8d6c7fbf3d6f1fbdf7e9f2319c9004d SHA-256: 4582c2d593ffbc0ec416129d128be99588c6f78099e04042f8112ac7aa7ac84c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the structure suggests the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+does+the+ab+lounge+ultra+work
    • http://desajegurake.scienceontheweb.net/nemorekijitomofovab.pdf
    • http://lajodibibodi.getenjoyment.net/bronconeumonia_sintomas.pdf
    • http://penageli.getenjoyment.net/74337234211.pdf
    • http://tefuvawilutir.mypressonline.com/49817711284.pdf
    • http://libopadu.scienceontheweb.net/metro_valencia_mapa.pdf
    • http://veselutut.mywebcommunity.org/agricultural_science_textbook_grade_11.pdf
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/27dfecdf0a7.pdf
    • https://vikuregarune.weebly.com/uploads/1/3/4/5/134577585/d0037a.pdf
    • http://copyrightmediahelp.com/world_history_bookppc7q.pdf
    • https://wexejapu.weebly.com/uploads/1/3/1/3/131384175/farijuma.pdf
    • http://burrrhey.tech/linear_algebra_solution_spaceymb7z.pdf
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdf
    • http://callipakk2.site/31367620545zclhl.pdf
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/vasesazamovibopefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejeseja/memories_bring_back_memories_new_song_lyrics.pdf
    • https://s3.amazonaws.com/xowasosuf/kelutagekiguloliz.pdf
    • https://s3.amazonaws.com/kitakilesa/jelly_belly_49_flavor_guide.pdf
    • https://s3.amazonaws.com/pezofut/alcoholic_whatsapp_status.pdf
    • http://fugufaza.myartsonline.com/how_to_construct_a_dilation_with_a_scale_factor_of_3.pdf
    • http://niselasot.atwebpages.com/delete_blank_pages_in_free.pdf
    • https://s3.amazonaws.com/pexodugosa/relapse_prevention_plan_spanish.pdf
    • https://s3.amazonaws.com/farowug/91664669388.pdf
    • https://s3.amazonaws.com/rubidokezive/tixakipolasotenizajinit.pdf
    • https://s3.amazonaws.com/fosawef/puxogozukabaveperawupotik.pdf
    • https://s3.amazonaws.com/zafijukopa/xogosolopukazaxiwopekakil.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_off0000f986.bin
ced62d4ac6ee368838126077f9521e649fe7b9eff1adf3d33fbb86c7b3c883a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 5344 bytes
font_01_sfnt_off00010bba.bin
5d0a8837342232af1b72bab84d02bad2e2024dfefcd6fe782eaa9b5ed5d503f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 10576 bytes

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