Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40099cbdaa731f2…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 18:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 25b5de0304559fc431dcc3253909b3a8 SHA-1: 90bcfbdafb6d1f141b748b1dca73324ec0b5021d SHA-256: a40099cbdaa731f26ff951b6a92850530ad138d87fa40e8287e13db3df14d856
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on directing users to 'kuzutuzo.ru'. This URL is flagged as suspicious and is part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier strongly indicated maliciousness, supporting the assessment that this document is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://kuzutuzo.ru/award?keyword=biela+manivela+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481422/normal_5fd222cc3a6c6.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/geSgdgi/hypixel_smash_heroes_all_master_skins.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_6002f02dcedf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fd82611b76df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456699/normal_5ff88d6aa74f8.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/8gigfMP/79219151423.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/xIgcsha/deck_eleven_railroads_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/2hcuQut/download_lifeafter_versi_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/toliximozupa/Rk8ihyf/ihc_test_report_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_6049f6c476e02.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/3d8f853a-e7b8-4633-babc-1ae5108cbec4/sony_portable_dvd_player_with_screen_and_usb.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_bd03a29e449646b29e3bb79a15972a2c.pdf?index=trueIn PDF document text
    • http://pepukogabam.rf.gd/bidal.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2fbe7f3633464743b49f9dcea0896b20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbc7c60-2f6b-405f-8ba6-ff1e81c85a9e/how_to_reset_password_on_samsung_galaxy_a10e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9a510e-8445-471a-b770-a23b31037f6f/jupyter_notebook_to_error_500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1eabcc-e5be-4f92-939a-b8a1dcda9ab6/87619830191.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_21d16c5055104705a6f10c905062d109.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_4037d29d46f74196b9faa49d05125bcb.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_ea7d1f101a0c4da385e31e890486e3ce.pdf?index=trueIn PDF document text
    • http://xiletubijalu.rf.gd/benovikubarafebivujojigo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 5020 bytes
SHA-256: 14c34eafe2845d41b0ae1dc3888ff19a777de4226994d05f18a673a65f6ea27c
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 12332 bytes
SHA-256: 4edb290046e872bdf353db80c9d6a2cdca511d8c941e098b79e825a1678c348a

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