Malicious PDF — malware analysis report

Static analysis result for SHA-256 c837556d70c77437…

MALICIOUS

PDF

107.6 KB Created: 2021-04-19 20:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6114353f7988a225c90d2a4a532665c2 SHA-1: b875d34cda240f42ae1d70fc252c717669bc289e SHA-256: c837556d70c7743787f6676c304839cc72015c1b9f18e55dcc0be9509c844bfd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a phishing lure disguised as a search result. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=what+are+the+ranks+in+royal+navy PDF link annotation
    • https://cdn.sqhk.co/gupimupiset/fhecaja/digital_marketing_agency_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/giNgdhe/68832349535.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/bomwWhh/28214422484.pdfIn PDF document text
    • http://natorg.space/puzzle_forge_2_mod_apkck2tr.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/69665386694.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/0zjj91z/61307666625.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/NgficVw/spinal_cord_injury_2013.pdfIn PDF document text
    • http://segway-wheelchair.ru/35590442364lz0p6.pdfIn PDF document text
    • http://revershjtb.site/how_to_install_verizon_4g_lte_network_extender_2e348a.pdfIn PDF document text
    • http://yazansoft.com/55452731308zcfnl.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/a6CibU8/maserati_quattroporte_gts_0-_60.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/hjoggYf/sitipufixosaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddad3463-b5a4-4ae9-b92b-9b5d4d2b73f8/7596782799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6d4f4b-1820-4d4f-866b-5a08ed5fac24/negarimukuvafomexewefi.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/mini_14_hogue_stock_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/mokugarezobenilakivirijo.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/lezune.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/catapulta_de_contrapeso.pdfIn PDF document text
    • http://gagolabirej.atwebpages.com/szck_trleri_konu_anlatm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e2b4d0-27f5-4414-bda1-cbaa07bb3662/how_to_change_voicemail_on_iwatsu_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/una_cadena_trofica_esta_formada_por.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5813c039-ae52-4a26-91a3-e9bd4d9ce7b0/why_is_the_press_unofficially_called_the_fourth_estate.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/bintulu_port_annual_report.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_off000167a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A1 5012 bytes
SHA-256: ee2069723f5a7d66671a5c1d04dca45d1656be6fa174b720ec47b83110bc74e6
font_01_sfnt_off000178bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BC 11952 bytes
SHA-256: 1113aa41706547d09f8a8065757fe76b9707a3f8c9b52580c9a8ae191b99c943

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