Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9c1b91acacd8fb…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 09:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b0dcce8a62736223525e8c36bb863179 SHA-1: 5057f1824f3d3947a2e834d6ef1f5e3ffe84097d SHA-256: fc9c1b91acacd8fba6019b1471ebebef026f012f0aac31d269601a4d49a9a877
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9994

Heuristics 4

  • 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://jottigo.ru/wix?keyword=specific+heat+study+guide PDF link annotation
    • http://zumasuxujole.22web.org/howard_miller_grandfather_clock_wont_chime.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/dXg8kas/los_mejores_juegos_retro_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/Ehikrft/2495967630.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/Eiaa1Sp/37504547080.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/gegigeR/femiwuxipikuzamabujefi.pdfIn PDF document text
    • http://vajamerafimal.iblogger.org/1105765294.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/y5jbr1J/halloween_face_mask_amazon_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/w4jehid/box_simulator_for_brawl_stars_download_uptodown.pdfIn PDF document text
    • http://lumurezekosarew.66ghz.com/2014_jeep_grand_cherokee_srt_oil_change_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/Cidhchf/hero_puzzle_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/jayfhhT/99053555781.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/ibejeid/tap_biz_business_manager_login.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/tigewibejageju/how_to_draw_cute_christmas_stuff_easy.pdfIn PDF document text
    • http://dipubuwefo.epizy.com/19287629508.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/coordinating_and_subordinating_conjunctions_worksheet_8th_grade.pdfIn PDF document text
    • http://kizofenumuvuma.epizy.com/74271248075.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/a_book_of_luminous_things_by_czeslaw_milosz.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/adobe_after_effects_news_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/47963561050.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/46394952171.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/idbi_mutual_fund_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/emotional_video_song_3gp.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/12412126116.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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 5492 bytes
SHA-256: 9720a5d85be661fb2afff191634917c2817e0c60d4e5febdc1783a6e6ebd3540
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 11368 bytes
SHA-256: 43014b8aec8e38ba651fe14f6a641392c4dd5b41c48350e64f2703b2329cbfbb

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