Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8964c54d8988ca…

MALICIOUS

PDF

76.0 KB Created: 2021-06-03 14:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0731cd36a01412d977d74362209d013b SHA-1: 30af0743602db527bc5d6cc2af31a2829dfb34f7 SHA-256: 5c8964c54d8988caed9a51da292476512b0ecc463a1ffd3a52e6f7aaefa05791
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/pbw?utm_term=how+do+you+write+a+formal+letter+to+a+manager PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479925/normal_603ed1af3171d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_6063abcd9563b.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/lixanujevijowurijol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5ffd56fcd356a.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/borukusik_pogedi_jemuxe_pemujewiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fd38ae89b0f5.pdfIn PDF document text
    • https://lijiwowotu.weebly.com/uploads/1/3/4/5/134587055/69b0d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5fe9abb9c1e24.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/7897567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nolumemonip.pbworks.com/f/has_my_roblox_account_been_hacked.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/68347184028.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/formato_carta_poder_word_descargar.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144516780/maxxforce_9_oil_capacity.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144427551/neniluj.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144533040/sutanutumezivupigesuzo.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144529881/morajubutuwaw.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144530139/can_you_get_a_marriage_license_if_you_are_illegal.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144559935/kenmore_elite_oasis_washer_error_codes_f51.pdfIn PDF document text
    • http://kemuxin.pbworks.com/w/file/fetch/144555165/ver_pelicula_la_insoportable_levedad_del_ser_en_espaol_latino.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/39847104903.pdfIn PDF document text
    • http://zudilazo.pbworks.com/w/file/fetch/144515733/what_are_the_four_components_of_transformational_leadership.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412446/69957912064.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144440109/78981493195.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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 5204 bytes
SHA-256: f0853c1cfe029a37b2bcd21dc433ae28c31c4ba6eeda6c81de9110b9e15525d3
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10196 bytes
SHA-256: 7013110a059db018039d9c399c80ca78eefa40d41a6e9d89551bd66462665b92

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