Malicious PDF — malware analysis report

Static analysis result for SHA-256 9175af11a407d06f…

MALICIOUS

PDF

85.3 KB Created: 2021-04-01 21:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3d3a8bd32032e523a35c93fb20100b4b SHA-1: 7f07587fd03b47784e52381c52ff98e1e96409c0 SHA-256: 9175af11a407d06fa3e7c30477e92445291a8fb1ad48bb9321ed9e87fd920547
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=ballet+sue%25C3%25B1o+de+una+noche+de+verano+completo PDF link annotation
    • http://ladebizelase.scienceontheweb.net/python_language_reference_2._7.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/cash_flow_statement_class_12.pdfIn PDF document text
    • http://boldly-grow.com/vehicle_check_report_vcr_number_odishak35z4.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/what_constitutes_a_breach_of_trust_and_confidence.pdfIn PDF document text
    • http://blockingscenery.com/15408260431zxlx.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/drawing_line_graphs_worksheets.pdfIn PDF document text
    • http://welutotadaxol.iblogger.org/paradigma_biopsicosocial.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/excipients_used_in_tablet_formulation.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/boggle_board.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/icecream_converter_for_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_345fddc68ba3443fb9a03f7c81f2b01f.pdf?index=trueIn PDF document text
    • http://witesenigo.atwebpages.com/biotechnology_process_and_application_class_12_notes.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/trigonometry_10th_edition_lial.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_0a8b0ec3e5fd4e9e923869a36465cab1.pdf?index=trueIn PDF document text
    • http://kodupupavob.rf.gd/woolworths_catalogue_sa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 5632 bytes
SHA-256: 15abed1acf0de39fd001938ddb6fc75fca4d81cd96bd2ab55b52b49cdb114db7
font_01_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 14388 bytes
SHA-256: 9a9edad0f4095c3a5599f2e37abbeb1bdf77ab57726ef462cf338a29260efb1f
font_02_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 17448 bytes
SHA-256: 0e54a6fa294379157223a793f82c2db44a3cd9d204bc95037dbe130bb31bedf9

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