Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6efa793e9c5700…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 18:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 59f84c75e79e8bf9a228c7ac827b1467 SHA-1: 51a6e70d76c003ce91282925ae0007b87e95ce54 SHA-256: 4d6efa793e9c57007cd85427c92c3376762192ac5bc211b13e27c4037f90ce05
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 0.9992

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://pelibifir.ru/123?utm_term=beast+quest+ps4+guide PDF link annotation
    • http://kugewezebuvigiw.mygamesonline.org/medical_virology_book.pdfIn PDF document text
    • http://mx50off.pro/nys_franchise_tax_reportl97cp.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/how_long_does_a_solar_g_shock_last.pdfIn PDF document text
    • http://clebohets.xyz/how_long_are_the_extended_harry_potter_moviesiuzcc.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/spring_basic_interview_questions_and_answersogcs2.pdfIn PDF document text
    • http://indital.fun/jesus_storybook_bible_curriculum_preschooljo6e2.pdfIn PDF document text
    • http://velixone.66ghz.com/gadoratujebuf.pdfIn PDF document text
    • http://esplus.pro/mountain_athlete_sandbagio72t.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/web_services_automation_testing_tools.pdfIn PDF document text
    • http://zebizadojol.iblogger.org/digital_electronics_multiple_choice_questions_with_answers_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvumitibeve.rf.gd/xitojeboxu.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/82953357159.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/copper_sheet_weight_calculator_kg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3becd4-b0fa-4629-aa51-b91cb96278f7/how_to_reset_kenmore_washer_dryer_combo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff80fbac-9839-4d35-879b-8e01fd15aa24/ionic_bonding_diagrams_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/puretobajaj.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_987330f5a8e74fa19a6de343872870c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7ec36d-2c9a-46de-99dc-02520eaac36a/phonetic_alphabet_print_version.pdfIn PDF document text
    • http://gegokuberil.rf.gd/alphabet_chart.pdfIn PDF document text
    • http://gevorewububew.epizy.com/1223564771.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_ddd3f49cb494475a887159b746089d92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9093351-080e-49ae-ba55-345ef720f51e/2009_honda_civic_transmission_fluid_change_cost.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_46638cd61bc14cafbc4a37079b82d1df.pdf?index=trueIn 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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5260 bytes
SHA-256: 097d1a178217d44f5d7515c1f1efc1fd1e3a7e0e4f52a5e986bce30655f0bf88
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 10980 bytes
SHA-256: d3168fa99764da66f69f2e2fc02abfe706d5e4c816f21145f2adff277055da9d