Malicious PDF — malware analysis report

Static analysis result for SHA-256 4971750add5ae101…

MALICIOUS

PDF

78.7 KB Created: 2021-03-09 09:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0e34e179cbd0a44bf1216e251d2912 SHA-1: 1a03992eb41d8c4a50755b28a68a2dc8c8a8a973 SHA-256: 4971750add5ae101be63ecfdf9b1c55301f8267a0b057248c434b6ffa7469f5c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as search results or document downloads, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing 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://leonvi.ru/award?keyword=angularjs+2+interview+questions+pdf
    • http://chelobaka.space/salon_de_belleza_mario_bellatin_analisisv0gpe.pdf
    • http://rumigiwataj.getenjoyment.net/36438352708.pdf
    • http://vidclips.design/adding_and_subtracting_negative_numbers_worksheets_ks33i0l0.pdf
    • http://nnorm-id.com/jazz_piano_sheet_music_musescorexdzfa.pdf
    • http://vifezitenof.getenjoyment.net/el_ftbol_a_sol_y_sombra_wikipedia.pdf
    • http://puwonasomoso.22web.org/58884676543.pdf
    • http://busurman.space/que_es_el_contexto_geograficof6din.pdf
    • http://vemajewedekag.22web.org/gikuxinomuvidepuk.pdf
    • http://on-arenas.com/charge_2_not_syncing_sleepic35g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a3e5e7e8-ca85-4686-9c59-f6030090c4ab/fetuma.pdf
    • http://tereralubo.epizy.com/menoma.pdf
    • http://tukutuxobolekub.epizy.com/antimicrobial_drugs_pharmacology.pdf
    • https://s3.amazonaws.com/xurixado/89561032543.pdf
    • http://tarepos.onlinewebshop.net/54590098275.pdf
    • https://uploads.strikinglycdn.com/files/40e76ed2-033a-4736-8c36-6a182d53dbd5/79025835788.pdf
    • https://s3.amazonaws.com/padadutiseni/buxewusudo.pdf
    • https://uploads.strikinglycdn.com/files/a5bdb830-d099-44f6-adfd-5660a8202140/snark_hz-1_tuner_review.pdf
    • https://s3.amazonaws.com/viwoxuz/guxanujujag.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_off0000f6b4.bin
3936393b71e04ee53935895c15de4db9c235314a9989451f30dcebd414e8193f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 5684 bytes
font_01_sfnt_off00010a35.bin
20e9ccbf287087d1d3e87b049f87fad9881fdf595d80c17ed7fcc892513763b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 10592 bytes

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