Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada1f4441aa7c1f1…

MALICIOUS

PDF

67.7 KB Created: 2021-06-09 08:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d61f3d3fe7e07dec54acbf3c54c04f29 SHA-1: 55ab84821e531079f379cd60d887c13d11600806 SHA-256: ada1f4441aa7c1f11708b6b7968261f0dea714f4ede431f6b8e19b4ea1dc85c8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. The PDF contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a phishing or malware distribution attempt. The primary malicious URL identified is https://pistant.ru/pbw, which appears to be part of a scheme to trick users into downloading files.

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://pistant.ru/pbw?utm_term=clark%2527s+positioning+in+radiography+13e+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446931/normal_5fdd6670a495f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fcaab2e3634b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc7ca5027272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misabovu.pbworks.com/f/subject_and_predicate_exercises.pdfIn PDF document text
    • http://fufitan.pbworks.com/f/how_to_setup_my_zmodo_cameras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c35df59-1836-40fe-92b6-8e79307fb926/how_do_i_reset_my_hp_probook_4530s_to_factory_settings.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144426375/pdf_calendario_2020_mexico_para_imprimir_gratis_chile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ad01a3-9047-4eb3-87ff-90355498a614/26100704862.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144450441/how_to_find_my_adobe_xi_serial_number.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/wejulirerini.pdfIn PDF document text
    • http://polujare.pbworks.com/f/sleep_ielts_reading_answers.pdfIn PDF document text
    • http://gosavepifij.pbworks.com/w/file/fetch/144927171/gusajejorisawutorapomaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39d039b-1a9c-4752-9d93-02549b0f52ec/p90x_lean_routine_workout_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5ff3c0-bc01-40a2-897e-9fef1aec2d49/the_conference_of_the_birds_book_5.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/f/how_to_hide_apps_in_android_without_any_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d225cd64-8495-4ad1-9803-b5757672c901/2018_tesla_model_3_long_range_rwd_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a85271-2f14-4e7c-8800-8e88cb3fc277/how_much_does_it_cost_to_lease_a_tesla.pdfIn PDF document text
    • http://sirazumebow.pbworks.com/w/file/fetch/144561270/arduino_nano_proteus_8_library.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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 5716 bytes
SHA-256: dcd602ceb59c2896073a64bb2222dd2ddbab6cc8b4331b92b0110e56d5007215
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 10420 bytes
SHA-256: 1f525ca719053f04969eca6e8f2d3de9ce4f5a438bfd19317b24761b33fbc9ce

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