Malicious PDF — malware analysis report

Static analysis result for SHA-256 9939c82e3b813f40…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 01:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 54174fe8b1903405a0fab97fd787d8cb SHA-1: 9140f7551b4d8b1a24bbfb6ffee8b5f6d9b9a3b0 SHA-256: 9939c82e3b813f403ee8f03858b56a44807790bb3769830ec97d4d45ec76d062
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://botokaw.ru/wix?keyword=arithmetic+sequence+worksheet+grade+10 PDF link annotation
    • http://seweripuwas.mywebcommunity.org/algorithm_tutorial_bangla.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/gcIulig/devuzofozof.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/ibhegf2/bike_rush_2.pdfIn PDF document text
    • http://premiumpornclips.com/sorerizurerijotepbkpud.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/h4ThdQb/92768503862.pdfIn PDF document text
    • http://dressnbuy.com/14420850897yhn6h.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/RifGgj7/little_ant_colony_idle_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_97216c566b2e4535b4ca83a3eb19f24f.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_c87a9f69d76a4f72bdff815099fb5191.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/psychology_thesis_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/6th_grade_worksheets.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_ec9c83d504fe4692b53f991a2a44451a.pdf?index=trueIn PDF document text
    • http://lusajafimaneru.myartsonline.com/bioshock_rapture_ita_download.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/java_offline_installer.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_2201e59f844748e5b512d5060c666e49.pdf?index=trueIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_05d175527a3a4bbeba68ffc15c66f543.pdf?index=trueIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/hr_project_report_on_employees_absenteeism.pdfIn PDF document text
    • http://zotubune.myartsonline.com/fallout_4_modify_companion_affinity.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_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 5784 bytes
SHA-256: ef809f46b85bc0a793415f76cf8847906c253eaeaa9294ecca93713106cb6c5a
font_01_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 11428 bytes
SHA-256: 85953605d347e5567f75bc381965c240586bc5c3b8e2d11641cba86679d18767

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