Malicious PDF — malware analysis report

Static analysis result for SHA-256 287e0d17ee8ffd0a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 21:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 563e0cd94094e0562acb9c1fce9c5557 SHA-1: 39c0d17cf332ca9a83aee5a1a1be09f42ea1f125 SHA-256: 287e0d17ee8ffd0a2cfba4ee0912aa0b5850b8d65e68de70203b8abc7208d003
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The high-risk heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates an image lure pointing to an SEO redirector, specifically the URL https://xajibur.ru/award?keyword=vegan+bodybuilding+diet+plan+pdf, which is the primary IOC. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=vegan+bodybuilding+diet+plan+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404133/normal_5fd26e6d4ea85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5fd1e2039d186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_6014b6331f62a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5fe9f66a21622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_60380ae32e0f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450507/normal_5febdbe12ceb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_60023d18625fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5ff6c6668ab7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5ffed1dfa754e.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/64f54aa8-5211-4b02-8171-05fa73a8faa8/cisco_linksys_e1200_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7cb85f-9930-4fb4-92d3-209f4e4b8a20/preo_de_carros_usados_tabela_fipe_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207c02b9-4cbc-4eb7-84d5-795e825241ce/14805406819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ad4896-b4b3-416f-99d2-37e9fd8e574e/ritijewimebebufajibigapaj.pdfIn PDF document text
    • http://jagazuzigi.epizy.com/mobolagimubejugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddbfa0a-7588-4227-8757-c4746c92bf66/maytag_neptune_washer_pump_filter.pdfIn PDF document text
    • http://durakukulutozar.epizy.com/how_to_take_lens_off_mamiya_rb67.pdfIn PDF document text
    • http://valapapiwusujeg.rf.gd/84530006447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d9dfa1-44be-475e-a9ea-e516b9083e67/13012561574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5013f5e5-26f0-434b-8ebb-ef4ce06fa373/mijobizofejesupazotima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d9317a-48e8-4664-9ac1-c8a6ed06b6fa/the_components_of_a_velocity_field_are_given_by_uxy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60315e9f-d130-499b-a57e-30cb1bb07b18/jusaterutasomikim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ffac9ce-224b-44f7-aba8-193fb9739b1d/qantas_carry_on_luggage_size_dimensions_international.pdfIn PDF document text
    • http://bedawisanono.epizy.com/bezutoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650aec42-8fe0-4fdf-9dc2-809db10b27d2/57655234901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2644e74-0f6d-4926-810a-0c7ace6c5a2f/motor_vehicle_mechanics_text_book.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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5144 bytes
SHA-256: 10164ad20c124edd8bcdc68d0c19c4725e57cacbbdb59663bcd0a6454d35c255
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11076 bytes
SHA-256: 0677ff971dedbf96eda0260c95fa2f37a80a87e0af5e7ec8710c64d606987e94

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