Malicious PDF — malware analysis report

Static analysis result for SHA-256 6387da797418a9f3…

MALICIOUS

PDF

88.7 KB Created: 2021-03-13 19:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a771c5079126a2cba5371feef73c766 SHA-1: e765eaac46510cc14cdcaa2ac2cb4017adaa5563 SHA-256: 6387da797418a9f35196ae930f501a959ae42320cd12081f3b0132706f40be2e
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 0.9951

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://mezovuduw.ru/wix?keyword=dubious+consent+ao3 PDF link annotation
    • http://aycotoro5.xyz/dvoretskys_endgame_manual_drive13260.pdfIn PDF document text
    • http://fc-aromat.ru/grammar_worksheets_for_primary_students8cphr.pdfIn PDF document text
    • http://instapodarok365.site/76160206901d056b.pdfIn PDF document text
    • http://lg-copyrightforms.com/totirugiboxek29x66.pdfIn PDF document text
    • http://20970907.net/coffee_day_enterprises_ltd_annual_report7gun5.pdfIn PDF document text
    • http://like-store.site/kitchenaid_5_cup_food_chopper_walmartgtj97.pdfIn PDF document text
    • http://fherixq.com/mevugubavetoxumage8ua.pdfIn PDF document text
    • http://zespodsvetkoy.site/219295907895ux05.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/traxxas_tqi_transmitter_bluetoothhfa3j.pdfIn PDF document text
    • http://beamorem.com/awful_auntie_downloadi9c6g.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jFSIZHZ/williams_space_station_pinball_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/MXHhhbL/79399252623.pdfIn PDF document text
    • http://discount50.pro/jegamutugakomeroba1v8yg.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/IhegclK/funny_facts_you_didn_t_know.pdfIn PDF document text
    • http://changely.club/polakevuxetatutimomozexesny871.pdfIn PDF document text
    • http://salonop.xyz/dejelawililejak7bo0.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/hjhgrjj/mg6071_entrepreneurship_development_book.pdfIn PDF document text
    • http://yoptan.space/zigumirew5x5ru.pdfIn PDF document text
    • http://cleanup-sale.site/big_nate_books_2021rabfe.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/hieVihQ/maharashtra_state_board_textbook_solutions_digest.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_7ddd117ab982461bb978785755fa88c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajujiju/amd_a4_4300m_wifi_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/7300426349.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_a4bc495f68cc43be9271b7e91d0d81ff.pdf?index=trueIn PDF document text
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_95d09d9ac476441c9a3d09405f592998.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_ebad504a93bc431fbb12c60bd61327ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/file_from_aws_s3_bucket_java.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/66710550052.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_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 4852 bytes
SHA-256: cdedbb3fb71afc742835cd62e07fbc17dd4805f85bd47d84fc9de608e8370fff
font_01_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 11352 bytes
SHA-256: 0efe1709fec16a16d981f8463daadd46fea5b425cdcb14fdf91105a58fbb36f0
font_02_sfnt_off00014746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14746 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e