Malicious PDF — malware analysis report

Static analysis result for SHA-256 a719b160a7d19f54…

MALICIOUS

PDF

96.9 KB Created: 2021-05-01 18:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ebc4d47009450988db289f4fce87587 SHA-1: 60e91bc4908b24b303b56220daca56bc85fbe0d7 SHA-256: a719b160a7d19f54d2d55d5d2a7e2511730ae8a5a79cbe6640f38d1315d98b82
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to an exam, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=ap+english+language+and+composition+exam+2021
    • http://dobilarujokux.sportsontheweb.net/77097923791.pdf
    • http://jekefidaz.mygamesonline.org/69040935704.pdf
    • http://botavubapisod.mywebcommunity.org/wizibazapekalaxav.pdf
    • http://todayit.pro/lufujulebirep5p54.pdf
    • http://kigirifaduguv.getenjoyment.net/french_alphabets_with_english_translation.pdf
    • http://creditpm.com/starmaker-_sing_karaoke_songs_for_pc1ol1f.pdf
    • http://qlemelest.online/lulesuzoxasoa5l.pdf
    • http://tujubiluwanodof.22web.org/5408438832.pdf
    • http://loneresel.mygamesonline.org/18767601260.pdf
    • http://zebozewazogaso.scienceontheweb.net/2017_nec_code_book_chapters.pdf
    • http://kamikofonem.mygamesonline.org/woredamudo.pdf
    • http://kopuvimu.scienceontheweb.net/learn_how_to_trade_binary_options_for_beginners.pdf
    • http://tagepalalog.iblogger.org/99687192229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zuxokoberibaw.atwebpages.com/python_download_file_from_url_and_save.pdf
    • https://uploads.strikinglycdn.com/files/a47eba99-f0e7-406e-89c9-931f706b74fb/55778303565.pdf
    • http://bogalibamadom.myartsonline.com/ripivonatevudef.pdf
    • https://uploads.strikinglycdn.com/files/9ddb5c91-938f-40a8-b4ad-c8565b9c99a7/59941195230.pdf
    • http://zamonile.epizy.com/whatsapp_apk_telecharger_gratuit.pdf
    • http://didodijore.rf.gd/42719394612.pdf
    • https://uploads.strikinglycdn.com/files/7aee767e-31fa-41d1-909b-ecbf82cb93cc/nagituvotokogu.pdf
    • https://uploads.strikinglycdn.com/files/802e91dd-613f-48e5-9423-b89c7632836c/72467981869.pdf
    • https://uploads.strikinglycdn.com/files/1e86eb02-4bb4-4909-a1c7-98a5b62b2742/the_american_journey_early_years_chapter_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c70.bin
974e1ec4726ddac4c0868b92e0210192bd660b55af0827f4579382dd34784f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 5772 bytes
font_01_sfnt_off00015003.bin
11457ca1b8a420dc7c8364c4678999b3ff4a6489b8dd941bc3cd470e359f4d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15003 10952 bytes

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