Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cd8a38a73349ce…

MALICIOUS

PDF

101.9 KB Created: 2021-04-16 00:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9374f63a419b094f59c675cdcde36a43 SHA-1: 13c6b5a609c6010f5ecc67a392687daefcb854ca SHA-256: 59cd8a38a73349ce614f9fb8eb9dec38bc051c1bb4d92d668fe102a2dd270ecf
134 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a large number of embedded URIs, many pointing to disposable domains and link farms, suggesting a tactic to obscure malicious destinations. The presence of urgency language further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=denon+avr+1513+remote+code PDF link annotation
    • https://cdn.sqhk.co/xudevekelefe/fmfgi39/top_popular_ringtones_romantic_2020.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/braindumps_70_410.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/gw3Xa9a/3253956552.pdfIn PDF document text
    • https://cdn.sqhk.co/polirorenu/nhjLjja/facebook_logo_font_color.pdfIn PDF document text
    • http://front-glass.website/63363666730jp1ga.pdfIn PDF document text
    • https://cdn.sqhk.co/lujobitazeku/e2jbhb0/71724013537.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/completing_the_square_exercises.pdfIn PDF document text
    • http://kokilubowo.22web.org/how_to_repair_singer_sewing_machine_foot_pedal.pdfIn PDF document text
    • http://drenajkrasnodar.ru/how_to_tell_if_youre_eating_too_many_carbsnceo3.pdfIn PDF document text
    • http://cz-nitrof.website/zoom_cloud_meetings_free_web_applicationz32d4.pdfIn PDF document text
    • http://blog-millionaire.buzz/arnold_schwarzenegger_blueprint_to_mass_phase_3gj6rd.pdfIn PDF document text
    • http://nazhivy.net/jurassic_survival_island_ark_2_mod_apkrv1yo.pdfIn PDF document text
    • http://hristogrigorov.com/91739306799nxm5g.pdfIn PDF document text
    • http://gotexewadegu.iblogger.org/gre_quantitative_practice_test_with_solutions.pdfIn PDF document text
    • http://lanabinowexibum.22web.org/pediatric_volitional_questionnaire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buteboregof.epizy.com/nawesuvok.pdfIn PDF document text
    • http://selaxarizipa.rf.gd/sotej.pdfIn PDF document text
    • http://dibulorofo.epizy.com/rajogederivezazowi.pdfIn PDF document text
    • http://gusipeviriw.rf.gd/danabuzokag.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_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 5272 bytes
SHA-256: 06275582497cc40e8469c92cde63be82ffaaf607ae34dff6d2790df7df78e7f2
font_01_sfnt_off000168d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D6 9824 bytes
SHA-256: 59a44c6f99f14d5e0556eff0fb2a20f9da71b93f9e469f599f44ec418c488e8a

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