Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8c6764e5931e1b…

MALICIOUS

PDF

85.7 KB Created: 2021-04-08 00:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3c6fe59fb86006281d399dee21fc3b39 SHA-1: 24be830f8539399dd375bebe99f8a1f0f0b2816c SHA-256: 3f8c6764e5931e1bdb8da0f4dbcc8f556c42522614dc4868214f5111d59e38eb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting domains and are structured as link farms, suggesting a phishing or malicious redirection attempt. The primary URL, 'https://midufefew.ru/strik?utm_term=q+significa+la+palabra+aleluya+en+la+biblia', is presented as a search result, likely to trick users into clicking it. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=q+significa+la+palabra+aleluya+en+la+biblia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469350/normal_6065a1026f1d6.pdfIn PDF document text
    • http://kavuwabu.22web.org/talarutigonuderozufovu.pdfIn PDF document text
    • http://xilagima.66ghz.com/vorofemudinonuluda.pdfIn PDF document text
    • https://puwixono.weebly.com/uploads/1/3/5/9/135957765/wibujowapokaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_604f48ad8d128.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/sijowuka.pdfIn PDF document text
    • https://zejanedigerexig.weebly.com/uploads/1/3/4/7/134757062/peribowotixize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sigafuveno.epizy.com/37561290605.pdfIn PDF document text
    • http://xelujoweda.rf.gd/dns-321_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/lefotunagusizowawewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac06680-f1a5-42d1-99d8-a185c6010941/alaska_coal_stove_thermostat_system_manual.pdfIn PDF document text
    • http://bumumewevebav.epizy.com/why_was_urea_not_able_to_diffuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2a2718-1f6b-4d85-ad90-8df1b2bc49c6/pisavanozajevof.pdfIn PDF document text
    • http://zoregok.rf.gd/format_of_cash_disbursement_book.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/27933962741.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/68772832856.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/convocation_form_unipune._ac._in.pdfIn PDF document text
    • http://tujukiji.rf.gd/38825669781.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/xegitu.pdfIn PDF document text
    • http://nogekaz.epizy.com/cambridge_primary_english_stage_6_activity_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 5488 bytes
SHA-256: 2bf7e0848ff45e9cc3d7fb50462bf2315d459a628ffdb314c8ce50e6cd787114
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 12656 bytes
SHA-256: 396296fce0304c2e57323221634cfdd7efd90db21d61236f42ed32f2c6a65cc4
font_02_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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