Malicious PDF — malware analysis report

Static analysis result for SHA-256 326ae99c6514c0c3…

MALICIOUS

PDF

84.9 KB Created: 2021-05-02 14:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 704fe141a5344e68f958e97894b1648e SHA-1: e73db6d4548fbfdf9ce318a0378db646d6b56593 SHA-256: 326ae99c6514c0c3bae80fa746d425243494897af4bc537c128f60566cf55aba
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=brittle+star+features PDF link annotation
    • https://cdn.sqhk.co/wularumijif/geIFgjj/23089084733.pdfIn PDF document text
    • http://sekejibugu.iblogger.org/lenaxujisigebubijonopilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_5fec34b7180d5.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/yhDggsx/receitas_de_glace_facil.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/ghc8uhd/wesuxufapajosulotafolok.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/hiweNie/dilidusotuxenadigitazu.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/5BbjfCs/count_dooku_lightsaber_toy_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426257/normal_5feafc0b95533.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/bTjjhTB/80_alternative_music_dance_mix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_601f166993c81.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/Didihca/82725132406.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/n0hiPeD/castle_wreck_22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_5fa35cc5f461462ab46d30ba21d7f4ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/9415026211.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_bea2c2a087d242f79e5eb3ea9e2330b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukedil/4726744532.pdfIn PDF document text
    • http://vefofiben.rf.gd/65529904893.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/pixlr_collage_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/31130127775.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_6701196d04384164b16e65cf77b6e3c7.pdf?index=trueIn PDF document text
    • http://begogosu.epizy.com/objective_agribusiness_management_book.pdfIn PDF document text
    • http://junebipizazob.epizy.com/57572256564.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 4476 bytes
SHA-256: 2d7ec461b4616df7df149ca5b677540297804c3a64d9623ebb16889c6d85fd14
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 10916 bytes
SHA-256: 6d9596a9cc44db38cb34993d995ea71c8cfe4d73dc2ec53d949df8e41822f58a
font_02_sfnt_off00013840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333