Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc25ed47a37fd99…

MALICIOUS

PDF

71.7 KB Created: 2021-02-17 17:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a19b1c87200a736dc06731b1d5fb985c SHA-1: 70ef5d65e7b8123b553dc1133115a75cfbf44db3 SHA-256: cdc25ed47a37fd99e3e7bcd990baff4c42bbe80d9b825f8b2e3f71fd6161f1aa
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a prominent one being https://leonvi.ru/123?utm_term=how+to+find+area+of+compound+shapes+ks2. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely involving a phishing lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=how+to+find+area+of+compound+shapes+ks2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fea3481a3947.pdfIn PDF document text
    • http://mediaverifiedbadge.com/equus_peter_shaffermjev4.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/hhgidIR/ncaa_football_schedule_2020_week_1.pdfIn PDF document text
    • https://doxuvufunufake.weebly.com/uploads/1/3/0/8/130874670/nalazu_tikisadoz_doxubo_ridesunovara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_6026af2068823.pdfIn PDF document text
    • http://mosdendy.store/adinkra_symbols_listlibeg.pdfIn PDF document text
    • http://kekisire.22web.org/37476447096.pdfIn PDF document text
    • http://kinoogf.space/gizufaxikexipotabivajanu2p6xo.pdfIn PDF document text
    • https://xezitolisaja.weebly.com/uploads/1/3/1/4/131406502/kaselelajad.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/gcgegfz/42979537916.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/rational_and_irrational_numbers_worksheet_doc.pdfIn PDF document text
    • http://larts.digital/jivozodorizetonotwjhyg.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/commando_2_game_miniclip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6010d081703a7.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/rUUNgg8/mount_fuji_sunrise_view.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_601f8d8cef77a.pdfIn PDF document text
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/fizadajiwituwo_lasajalujeman_firawajafawina_nezoraku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupejodolet.epizy.com/97013300340.pdfIn PDF document text
    • http://lutepebenunara.rf.gd/95522909207.pdfIn PDF document text
    • http://vuzudaru.epizy.com/zaxadavuruku.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 5612 bytes
SHA-256: b47045b0a23383ce2037676c41db33207b349e30333ef97149c30d3d09376612
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 10776 bytes
SHA-256: fa6f5d18b3b5076caa52eafad505c2cc6bf15bd0a003f1f079dd49c0d83f7322

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