Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f33d14caea4b2dd…

MALICIOUS

PDF

85.0 KB Created: 2021-03-30 14:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 379b2323a11cb4b10289592125286674 SHA-1: a05e2c2ad978a461994e18a7ed06afe4bf22e43a SHA-256: 5f33d14caea4b2ddebfaee31e7b717f6ccb0b2d40b408847d57220710415a903
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to suspicious domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=cartagena+protocol+on+biosafety+2020+pdf PDF link annotation
    • http://xufikefizot.sportsontheweb.net/45109509002.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/98009263270.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/wuzopi.pdfIn PDF document text
    • http://disozire.mygamesonline.org/15924379167.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://s3.amazonaws.com/wudibirewuduto/club_car_precedent_accessories_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/vorenakepepetagoxoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fad2a3-d781-4703-9596-15d2c632c516/kopadolutuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/pupejerowoj.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/figamulowazurupiwava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1a7919-18b5-4c2d-934e-3e107262ff24/willy_wonka_and_the_chocolate_factory_opening_scene_1971.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/bank_5_fall_river_ma_phone_number.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_ae72e14975704feca94483a59aa7d1cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/804588cd-f1fe-429c-a2a1-2f55a6b7bd00/gunaji.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/56222951783.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/93535988221.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_869c49006ee3441ab8b40e195396a65c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/instagram_analytics_report_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/annual_report_hotel_mandarine_regency_tbk.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/pofolizeviwulofilugaxaz.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/91653371340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8975be4-1344-4fd5-81b3-e09293d2228e/mibope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951b18e1-7a32-4fd7-8345-797b36024b0c/64837891735.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_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 5648 bytes
SHA-256: df0452727f3d86154227aa9e051da88f5ee7d13c76b18b520e5b288e53c2db44
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10752 bytes
SHA-256: 80f0abefc62bd94582291c660457e420a347c13cd8b5fd4829b7e75fb87a8e87
font_02_sfnt_off0001386a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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