Malicious PDF — malware analysis report

Static analysis result for SHA-256 93821709bb86cc94…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 04:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 68051d3b5bf00d0ac2127e802023063a SHA-1: b3ef6f42a1e0acd620a963ef64fe05a6b118854b SHA-256: 93821709bb86cc943179db70b6fb4e2f47fc8c347132983563610b8ddb8725bd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/award?keyword=musical+acoustics+hall+pdf PDF link annotation
    • https://cdn.sqhk.co/rudugebakivo/jgidPX1/sniper_ghost_warrior_2_system_requirements.pdfIn PDF document text
    • http://everydays.space/electronic_music_for_studying_mp3_download08ow7.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/Wjbmjjd/color_block_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/iggfCTi/98249288283.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/ibEhcgf/twitter_video_download_bot_telegram.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/how_to_thread_kenmore_158_sewing_machinemnn7h.pdfIn PDF document text
    • http://skywonder.space/google_chrome_latest_version_free_2019pjf3l.pdfIn PDF document text
    • http://yesstore.pro/lagekojan40q37.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/heihhd8/78711519073.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/jicv5hj/hoisting_engineer_study_guide.pdfIn PDF document text
    • http://copyright-central-media.com/setumoromenukobarineruda5djo0.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/hgiiEgh/38103003369.pdfIn PDF document text
    • http://espacecmb.xyz/how_do_i_change_my_medical_infrared_thermometer_from_celsius_to_fahrenheit8hfz8.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/jf4oggQ/likee_trends_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/jih9hgr/zombie_catchers_hack_unlimited_plutonium_apk_download.pdfIn PDF document text
    • http://dmdmassage.com/java_swing_guidebyv8i.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/ic8dCU9/80167944228.pdfIn PDF document text
    • http://rte-ita.fun/pentair_easytouch_control_system_troubleshooting79bkp.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/iggd3Xq/us_passport_renewal_application_form_for_child.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/1wgihgi/logistics_supply_chain_management_notes.pdfIn PDF document text
    • http://ketotreno.buzz/49527029744i2ufd.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/f9dce0bd-531e-4ae3-9701-e4c894176118/bareko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7649ffb4-e643-41ff-b956-9ef761d95279/tonogifabikawazekigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2113404-9748-42f6-97e2-83d3c9c567c4/yamaha_dgx_500_midi.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 5152 bytes
SHA-256: ac55920a5ab4eaaf0dea47a27f5b193d64428253c2075ebe107ca533258864ad
font_01_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 10764 bytes
SHA-256: fd362f4a6f755a62a27b9bb1741fc3cc1d51ffe64a8e068ab9e83b7729d678c2
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 16064 bytes
SHA-256: 0b6d67ed6f7b9ca340f69bc1efbee2cf1faeb02ae856abbfc241c325d1d7b232