Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdd18425e1f5ccf…

MALICIOUS

PDF

79.9 KB Created: 2021-03-24 18:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7958e6a48d19e043560818844cf01f27 SHA-1: 9ee02d7f3865ca462f630327e20edb4418c55101 SHA-256: 2fdd18425e1f5ccf5640664be64e185b7be57c54465b0fa39a025fc98cd9f0af
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to potentially harmful content. The document body, though heavily corrupted, contains a title related to 'umbanda and candomblé' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/award?keyword=diferen%25C3%25A7a+entre+umbanda+e+candombl%25C3%25A9+pdf PDF link annotation
    • http://morasuxod.getenjoyment.net/43389863800.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/todebijivenez.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/papomedutonudetu.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/xumezogudi.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/ehficYl/mini_golf_near_me_wildwood_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/hcpUI10/briggs_stratton_electric_pressure_washer_manual.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/gokuxupolofufi.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/what_is_a_shop_drawings.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/check_font_style_in_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/49439114465.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_307a132a84744d8e840c826659b68d03.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_259075e5fe7e4ebe94d21b8a1a569ffc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f20e25-e1c1-46dd-a081-5278e80a8451/37705033014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc598458-91e5-4c1d-9a4c-0d4f9381d053/choice_words_rhyme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f185a6-a9c7-455e-a68c-d55fdf05c640/22491061589.pdfIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_a2a25df8e3624c229d7101ab9eba79b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f202883b-a4dd-492f-b138-5dde33acf30d/posorilepalejilefatolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a248346-2835-4f21-8488-3c8a0900b563/fawimadedosejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9346dd-8b16-4f6f-92dd-6f40f4b033d7/principles_of_classical_conditioning.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_57a2b418c9274b71976b646edc88912c.pdf?index=trueIn 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://www.youtube.com/watch?vIn 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_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 5584 bytes
SHA-256: 171dd3ec7d0eff2002f19449f3b56bee44bdb3d6a0192807884de24d8f80245d
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 12924 bytes
SHA-256: a6a932ff60971fc90a5304d3951c448ed151072b1c3513bf71f007f5f18cad77