Malicious PDF — malware analysis report

Static analysis result for SHA-256 28398c5c0748e998…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 13:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9c9d7d444b4806e4d4ce991483eca30 SHA-1: 910634de4f7f02e0e70613ffcf34bdd451659f06 SHA-256: 28398c5c0748e9984abded88827c7092ba713d7f1a3fd4992fcb7614a71b0838
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to attract traffic.

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://botokaw.ru/award?keyword=adobe+indesign+course+outline+pdf PDF link annotation
    • https://cdn.sqhk.co/tiviluluje/GVY4Bgc/surviving_mars_colony_design_set.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/cVvztig/download_ultimate_car_driving_simulator_mod_apk_home.pdfIn PDF document text
    • http://ludshop.xyz/h_m_linen_bed_sheets1hx78.pdfIn PDF document text
    • http://xuxuxib.iblogger.org/easy_grammar_review_worksheets.pdfIn PDF document text
    • http://vamofawevized.22web.org/nutritional_anthropology.pdfIn PDF document text
    • http://lifegirls.site/55088667045t6gxb.pdfIn PDF document text
    • http://waxopuvuru.22web.org/arris_dcx3200-m_ir_sensor.pdfIn PDF document text
    • http://housefashion.ru/a_half_wave_rectifier_circuit_with_a_1kkpx63.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/SohfBl1/amazon_small_tabletop_christmas_tree.pdfIn PDF document text
    • http://dogusiwimukames.iblogger.org/pidukezefu.pdfIn PDF document text
    • http://legendnat.space/nurajawoxare0kjiv.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/0e50fdb6-1c28-4e66-9c03-76de401f593b/mental_status_assessment_nursing_documentation_example.pdfIn PDF document text
    • http://fotexamaluvim.epizy.com/jemeguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f490ebd-1fe6-4350-8831-3719e5fca889/81149034043.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_b28d2a0315dd40ce89b684c7fdf5e537.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_6e6de41a3a00428399346de35596b4b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a205ca9-e4db-40b8-94b7-3eeb88db77a5/el_nombre_de_la_rosa_resumen_preguntas_y_respuestas.pdfIn PDF document text
    • http://xexokutofopo.rf.gd/79930346433.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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5240 bytes
SHA-256: 5ea236c86b1bec6a6d33b5ee646d7e648e6e743b3c72f5a2377700e24880c6d0
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10752 bytes
SHA-256: f63b9e325d0df27dbe5301066b5310b31acdf967369d4cf20ef03445ec57a110

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