Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b4320af062f546…

MALICIOUS

PDF

86.5 KB Created: 2021-03-28 13:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c57dcbf4e8090988a05dbfb10312fc5 SHA-1: 15bae956a30df19251355dae813b31c102fd3ba6 SHA-256: 63b4320af062f546918d5f06d92b689e8b6e78bb3dd7676ed5ede088e2093363
156 Risk Score

Malware Insights

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

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 0.9990

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 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://kuzutuzo.ru/award?keyword=strength+training+plan+for+distance+runners+pdf PDF link annotation
    • http://vekvelo.ru/star_wars_legion_builder_appo6thp.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/ouqdvgc/dune_2020_trailer_leak_images.pdfIn PDF document text
    • http://chatik85939775.fun/brio_beardscape_manualm828v.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/eggOgcL/nedisatepusumisek.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/SjiiKja/hide_all_file_extensions_mac_os_x.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/gjjijgB/wolurasubineli.pdfIn PDF document text
    • http://wspring.space/ejercicios_de_multiplicaciones_de_do7vqp4.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/ggghTgg/turbo_stars_hack_appvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/welanisowari/actualiser_des_formules_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/best_free_android_phone_data_recovery_software.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/brachypelma_schroederi_care_sheet.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_d1e1a2081a3842519232bc6c41d408e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuniku/milodezotapomawaladi.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/flight_radar_24_tracker.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_73ee89bbba524811ad6cb76e9e235bd5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/transunion_form_to_request_credit_report.pdfIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_babbee97d56840e0bb801c7b112e267b.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_2b9c363908a543da8c79136e18f3f4e7.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_8ae67efab67644979ffec0bc898b4191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/google_cloud_architect_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/what_is_the_message_of_we_wear_the_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/how_to_control_emerson_tv_with_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/45144897171.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/70729682256.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_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 5520 bytes
SHA-256: 0d28266a609a8b1459d38ecd7d87f1f398e851b95cbdef749688e51d736e7d3a
font_01_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 12144 bytes
SHA-256: be90e415a4e5b924db5487a75397e18dcab25f0e22cf2c313d714b1b149fe2cc

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