Malicious PDF — malware analysis report

Static analysis result for SHA-256 781755a5829d99f5…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 11:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e578e2a30c3fa90c5187c460839ff3bc SHA-1: fa68481e4f0ab5e5bf2473313f49089ac190b836 SHA-256: 781755a5829d99f51c28f59b58babec24fa79055acd1ee4d1409aaac896135f6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and redirectors, indicative of a link farm designed to obscure malicious destinations. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/strik?utm_term=la+gallina+degollada+movimiento+literario PDF link annotation
    • https://cdn.sqhk.co/jopubelo/MsRjahg/38177451577.pdfIn PDF document text
    • https://cdn.sqhk.co/zolususux/YNYrhbU/79925785566.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/hdRjege/skylanders_giants_figures_xbox_360.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/jegisom.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/j1mgekJ/kansas_gas_service_deposit_charge.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/eijigib/5971957609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_6017a2cf8879d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fca0c512510f.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/urban_tantra.pdfIn PDF document text
    • http://kobazugipodiv.medianewsonline.com/dictionary_english_to_urdu_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_60461f460a7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_604513a9257a5.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/71427246613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/bareilly_college_private_form_2018_date.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/cardinal_numbers_exercises_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/my_sage_product_s.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/24331510343.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/o_que_so_grupos_sociais_primrios_secundrios_e_intermedirios.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_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 4968 bytes
SHA-256: 307ef10c4918d0a6c079228b115f8204fc791682472158dd27ddad36363a0dc1
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 11716 bytes
SHA-256: 1bd45b25c72046ed108f383815817580633596c53e5a031ba72d00d6faf37dad

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