Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d4f0caa487505f…

MALICIOUS

PDF

84.1 KB Created: 2021-03-16 22:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef1eb8ad5cd045c1ddf4c2ae5acd13bc SHA-1: b20e539021fd8a7e17e14bddc0c5e30c03f8712a SHA-256: c7d4f0caa487505fbe3a701b5d859f9c52d68374296f8db9721d960a5865ddb0
194 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its structure and embedded URLs, which indicate a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this is a phishing or malware distribution attempt. The presence of multiple external URIs, including one pointing to vilenefex.ru, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=how+to+write+a+screenplay+pdf+download PDF link annotation
    • http://verifybadgesbusiness.com/manupof47uay.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/9vjbShI/merge_dragons_wiki_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/u3KrFjg/vinamexujinivejilirej.pdfIn PDF document text
    • http://arevakar-travel.com/the_masque_of_the_red_death_which_statement_best_identifies_a_major_theme_in_the_storynhc1t.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/1ifhagc/wire_inductance_calculator_awg.pdfIn PDF document text
    • http://trackengine.host/how_to_write_10_100_as_a_decimalxz1e1.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/gdhaCja/citra_3ds_android_apk.pdfIn PDF document text
    • http://com-signto2.xyz/the_last_olympian_chapter_summaryabzah.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/ZZ6xvha/spider_hero_superhero_fighting_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/iiTyoax/33038768068.pdfIn PDF document text
    • http://madamzero.com/62969096332fh2ru.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/id4hbjj/50117637598.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/bbfnggc/jakazedujorewuritixosedo.pdfIn PDF document text
    • http://pollsexpert.com/thompson_center_hawken_parts_for_salecnb71.pdfIn PDF document text
    • http://macsk.space/all_excel_formulas_with_examplestysns.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/50VQsjb/vabanekeparogomine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_d5bae739245b4422a520fd69d2b27743.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_e06c43c7744c4dc0bc97bb7458bf5e65.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_49766fd7e3d24fcaa02b75653be3e690.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_2469239212e9484fa23d0343c39da709.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_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 5304 bytes
SHA-256: c8454065e1740f6b06e67e10493ee89728d093e363e83d8c0bdd476a98f99cd3
font_01_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 11384 bytes
SHA-256: c4dfcbd947df14447200439bf388e437eda1c0e78101f2a3675f8ef1f12db813

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