Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3ca88350cf5f0d…

MALICIOUS

PDF

113.9 KB Created: 2021-03-05 07:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff31fdba74f53b6adfc41d9d2e595ffa SHA-1: a0a1ccc7078ea7f32de3ed33a519062146d37800 SHA-256: af3ca88350cf5f0df1f04c5fb1ce2ac3f1f8ec06153bd97d00e835611792ed04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=rock+band+4+xbox+one+drum+adapter
    • http://mnogolidov.xyz/tableau_de_karnaugh_coursq2xq3.pdf
    • https://cdn.sqhk.co/fexejikexew/ghjb8gd/detuzikofetu.pdf
    • https://static.s123-cdn-static.com/uploads/4367650/normal_60037a8de0603.pdf
    • http://agentsecure.space/norwegian_english_dictionary_download_csv1a3wj.pdf
    • https://cdn.sqhk.co/xaripisi/gfewthd/fruit_slice_fruit_cutting_machine.pdf
    • http://eglo.club/the_daughter_of_time_audiobookdsdzl.pdf
    • http://eu-study.ru/sijif254xz.pdf
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5ff9f8dcf2bb3.pdf
    • http://edalovert.xyz/bugeditavizeskrxq2.pdf
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60268c9e95e58.pdf
    • https://cdn-cms.f-static.net/uploads/4447253/normal_603166c8092e1.pdf
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/getutubosetekew-topebamara.pdf
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/5598633.pdf
    • http://airned.ru/factory_simulator_2_codesnn3cm.pdf
    • http://urott-hu.com/39427151077xwul.pdf
    • http://petersikdar.com/where_to_buy_nutone_central_vacuum_parts4lwr9.pdf
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/14248f7.pdf
    • https://static.s123-cdn-static.com/uploads/4409607/normal_5ff0dfa066f11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/janodojivi/nice_guidelines_infective_endocarditis_update.pdf
    • https://s3.amazonaws.com/pegozegi/28933553298.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_off00018122.bin
159d2fbfe8713e57193f0c1c6f92d222465be8d51ad7ad0cc519f579edb466dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18122 5376 bytes
font_01_sfnt_off00019368.bin
7337a283ede3e4eecc1ca510b020d1e11f0b097d22953a00cf4d1dc158f32606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19368 11176 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.