Malicious PDF — malware analysis report

Static analysis result for SHA-256 495bb29364d16b13…

MALICIOUS

PDF

75.1 KB Created: 2021-05-13 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 042f51f829d4a7298ec703f7c2b701d0 SHA-1: 25747eb57e425ca793551a7ab502ad3c3f9a32a8 SHA-256: 495bb29364d16b138176177ad6dd3c6e931a50044eef9f57f0d1b9d74b6941b4
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of a URL in the document body, combined with the heuristic findings, suggests the primary goal is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=sketching+from+the+imagination+dark+arts+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375509/normal_6014fd3d14f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_603d48d053daf.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/what_vegetables_to_plant_now_in_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_603a48d2cc180.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/annexure_d_for_passport.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c51422-8938-42e0-b718-48dc59c32dbd/how_to_use_ninja_foodi_pressure_cooker_air_fryer.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/eloge_de_l_amour_alain_badiou.pdfIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_8240d5e6cdbd49c7a374b26ca472e846.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_576f1bb7e61f48e5a9c95961aa1cf14b.pdf?index=trueIn PDF document text
    • http://fidegaf.atwebpages.com/diagnostic_microbiology_laboratory_manual.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_db0aea74e1bf4067b0da9beaeaa64f4d.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_0d8f29196a3f41a490ef1cba962c30af.pdf?index=trueIn PDF document text
    • http://dawozisi.rf.gd/zovefominidajizab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e98a61-f268-4cc5-8231-e0a64d0b272e/how_to_find_atomic_mass_of_first_20_elements.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/16780008817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd954da-7148-4585-ada7-ead59ceeaa30/weber_grill_igniter_not_working_on_one_burner.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_6f3033a542fc46fe81c83073cb21e988.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://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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 5696 bytes
SHA-256: dabb8cac1b224ec23f557fb5303266f8bff5fea3b48b45041cc60de869e3a353
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 12492 bytes
SHA-256: d75abec0b055f31c1f444284b41cf8860f220cf22ab1f778753dcda1a46c301c

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