Malicious PDF — malware analysis report

Static analysis result for SHA-256 500a54716226fd62…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 12:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00c429edb72d27a7fe9f3c497c42c88f SHA-1: cdedcacf30299aa5e087983d44b75549834fe74e SHA-256: 500a54716226fd62428370d25c88f30bfd4751624a41cc7f1875d5331579213a
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=pediatric+cardiac+anesthesia+pdf PDF link annotation
    • https://cdn.sqhk.co/monasomeb/bibCpUt/47825680149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_601df4d89c67c.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/bienestar_psicologico_casullo.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/jgdGVNQ/bafoledajizisavibokavim.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/Pjbidie/85243866963.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/iiaphaH/formula_atlantic_top_speed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_6026576093a8e.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/QhaFjiq/fakirezasejavafojeki.pdfIn PDF document text
    • https://cdn.sqhk.co/xinosemu/igs2gfz/62747213832.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/al_quran_ul_kareem_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/fhihgjj/linkmedia_360_jobs.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/libimerirunog.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/dumaruforufi.pdfIn PDF document text
    • http://spindlndou.space/computer_hardware_engineer_schools_in_californiaauqtp.pdfIn PDF document text
    • https://cdn.sqhk.co/zubafena/tjarUig/flipping_a_coin_probability_worksheet.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/gasedowawujatigiurk14.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/gfjjiit/pig_hunting_shooting_games_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/97cdde85-4c7b-404b-8162-04a62b8bdb12/super_mario_sunshine_walkthrough_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f88cd17-21a9-4a91-b6a8-11598432eb05/88800973914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3101e6ad-0768-4ab9-8ac4-712e9b54d979/98056836581.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/72036967003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cfe373-fbc1-4c9a-a491-775659c774ad/how_to_clear_up_acne_on_oily_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31905911-85c7-4254-a23b-0212b246e249/vorixirazewusekod.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 5212 bytes
SHA-256: 99fe143b55f3c90ac44d26166226860f5ae1e36aa8b6b5065d6e3dcade71de6d
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 10480 bytes
SHA-256: 31c8ae67c07377817c5a96587b4ff04c18589b1b05e91c9f38709430dcf6e1b2
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d