Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7511856d5828182…

MALICIOUS

PDF

71.7 KB Created: 2021-06-04 08:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 472f3d50f168d6ac7738ca52f496e900 SHA-1: 4251746ff53209658e27d12b7fa0efa5335695ee SHA-256: b7511856d5828182db144d3e3fde42a873cdbe432ef5637c4ca4b535525ab805
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, with one prominent URL pointing to a suspicious domain. Heuristics indicate it's a link farm designed to redirect users, and ML classifiers and ClamAV strongly flag it as malicious, likely a phishing or trojan delivery mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics, along with the ML and AV detections, supports a high confidence assessment.

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://ketchas.ru/pbw?utm_term=principles+of+instrumental+analysis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fe78e394c52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_60108e14d821e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_604a593f4db3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufavuva.pbworks.com/f/amman_padalgal_free_download.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144437886/71864706044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b07b3e-c314-4548-a2ea-c0bb2ebfd5cc/heat_transfer_cengel_solution_manual_4th_edition.pdfIn PDF document text
    • http://morabef.pbworks.com/f/are_goebel_figurines_valuable.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/free_retrenchment_letter_template_south_africa.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144578277/mijelovadipodipotogalizut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1026e6-619f-443f-a77b-499439b15d7e/58091774728.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/fosodozeribitajivimela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ba1818-4b7e-4e7d-911d-880ca6ba8163/ccsf_esl_placement_test_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1966f7e-b880-4db2-8417-c7d68e0230cd/talisman_online_bot_uopilot_free_download.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/w/file/fetch/144544473/audi_a4_b9_mmi_navigation_update.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/how_to_make_money_in_mx_vs_atv_untamed.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/how_to_test_compression.pdfIn PDF document text
    • http://podimil.pbworks.com/f/gikuvada.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144413619/33539284728.pdfIn PDF document text
    • http://nonesupul.pbworks.com/f/tifafusuzizu.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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 5404 bytes
SHA-256: abfa99ab7b8553ecc38f7e722703628193a8c933b47a7d5be3a64b5f856721bc
font_01_sfnt_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 10480 bytes
SHA-256: eeaa74c358ca87f97541f9567e33d2fb452ef8dd0007cb6353f2dd9a18799874

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