Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c9eef776144b65…

MALICIOUS

PDF

88.1 KB Created: 2021-05-15 20:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cab955feb116333af3cad4c0a53e14e1 SHA-1: d525ed987d9c4fc53ec7e57f8f4824fff3d6dc3e SHA-256: 64c9eef776144b659c93ddd7221c68f4c121c15499eb294b3e4cff93eb434799
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many hosted on disposable domains, which are likely intended to redirect users to phishing or malware distribution sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+start+craftsman+leaf+blower PDF link annotation
    • http://bigwin-1xbet.fun/robakatazdnxg0.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/Ktj0gfi/dukidenidikew.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/alimentos_ricos_em_antioxidantes.pdfIn PDF document text
    • http://wide-mean.top/gerogobobuxijuruwunanogu9u3an.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5fef6a59e583c.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/31670831770.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/iheKhIS/helicopter_rides_grand_canyon_north_rim.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/0ghicZS/55275929279.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Agehajh/agricola_all_creatures_big_and_small_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_601f9b8221e30.pdfIn PDF document text
    • http://3203epworthcres.com/jedivakuwogasavburgf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5feba5a992c6f.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/xibufifopegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_602d94827a5b9.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/dgewJie/bekoke.pdfIn PDF document text
    • http://flipping-car.online/play_store_apps_old_version_apkg7s3x.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/bininojebudisujowixuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5ff08b3ae0795.pdfIn PDF document text
    • http://topsalon.xyz/wugaz73mhe.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/penale/lipelipe.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/87816381406.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/amsterdam_city_transport_map.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_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 5220 bytes
SHA-256: b8a6c583692b2a287f366483d6f3074066b0fa6d567ed159392b4981eb437024
font_01_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 11420 bytes
SHA-256: 187e65dd2540039353a68c64e2d277fcc6424a7c1ebcee8f4435caff993c0c79

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