Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33cc773bfeff999…

MALICIOUS

PDF

84.8 KB Created: 2021-04-01 21:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a020c532461e76716ba0cf2f0704a1dc SHA-1: eb3f3609697578a739014e21e7271cabc0e98242 SHA-256: b33cc773bfeff9994b2ffe30bc782a5d8388b184f051dfc44b5402ffef043b8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=application+for+canadian+citizenship+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500183/normal_6024ab732d801.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/autocad_2d_tutorial_2020.pdfIn PDF document text
    • http://daliadiago.com/4559718374vjyb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fcf60cf476d5.pdfIn PDF document text
    • http://igcopyrightclient.com/casting_wall_thickness_toleranceowe05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_5fd2413f7a51c.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/48232527744.pdfIn PDF document text
    • http://dreamingdeveloper.com/euro_train_simulatorpephg.pdfIn PDF document text
    • http://vutunema.mypressonline.com/garmin_gps_drive_assist_50_lmt_avec_camra_intgre.pdfIn PDF document text
    • http://momentikshop.space/vubibavomofegijazatoboxemoibbi.pdfIn PDF document text
    • http://dapujabowigu.sportsontheweb.net/8053276116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_604e8166b11a0.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/90662510306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5ffa347182f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_6065a129b589b.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/the_monkey_king_3_hindi_download_kaise_kare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fc6028d154f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5ff655549368a.pdfIn PDF document text
    • http://barberking.best/61076495390lgeqc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fe9345a7dd48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ecd161f5-1b61-4cd6-a2ee-174d0257c059/catholic_bible_concordance_online.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/nomifarifasikozexuno.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/the_z-score_associated_with_the_98_percent_confidence_interval_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8eefd71-1dff-4699-a5b2-bf4885e75f6b/bemuletukumuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbca556e-46cc-452c-ba38-4875d346fa0a/oracle_sql_change_datetime_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd935df-e47f-4e86-a859-154127c14ac2/64148618980.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 5072 bytes
SHA-256: 6b89f125357498b546a20d254848b3af22660f98ebb27609f5b7683ed509721c
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 11828 bytes
SHA-256: 646749f97c8285d2b7b99649885933c02b169ebdbe65031415c735a392130023
font_02_sfnt_off000136a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230