Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7fac0db4187cf8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 18:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be756855e46cf827dc01d011cfa1e3a8 SHA-1: 81d28216b761bc758e1f3ca259d7555e8e3165b8 SHA-256: ae7fac0db4187cf8bf98f90f30903bcef8bbfbdef142ba97c0dd8c366018b8d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://jumiwimov.ru/strik. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=what+alice+forgot+movie
    • https://static.s123-cdn-static.com/uploads/4496381/normal_5ff3cfae8bc1f.pdf
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fe6c10a5a803.pdf
    • https://static.s123-cdn-static.com/uploads/4419218/normal_5fef006d2981f.pdf
    • http://vezalijoza.22web.org/little_candy_shop_font.pdf
    • https://static.s123-cdn-static.com/uploads/4417834/normal_6008eb554a5e1.pdf
    • https://moganuvutixeku.weebly.com/uploads/1/3/1/1/131163890/8046878.pdf
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5ff42a30c8e0a.pdf
    • http://risonubokedoxav.scienceontheweb.net/clinical_chemistry_laboratory.pdf
    • https://static.s123-cdn-static.com/uploads/4374177/normal_60047d5824b7b.pdf
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/eb0c83fb43d8.pdf
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6045d49935c46.pdf
    • https://cdn-cms.f-static.net/uploads/4446152/normal_60411405c62b9.pdf
    • https://cdn-cms.f-static.net/uploads/4482218/normal_5fdad620ce1ed.pdf
    • http://zovitidagawas.sportsontheweb.net/router_command_line_interface.pdf
    • http://xigotazuwal.iblogger.org/arya_2_movie_bgm_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://roxutudutupit.epizy.com/scrum_master_certification_questions_and_answers.pdf
    • http://dubanexotokegel.myartsonline.com/bangla_to_english_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/53729bcd-ea77-4284-8d7a-c5816838927e/81458995375.pdf
    • http://gobudulofi.rf.gd/59249543135.pdf
    • https://uploads.strikinglycdn.com/files/b260e13e-c560-4062-885f-706744ca3d89/2010_cobalt_maintenance_schedule.pdf
    • https://uploads.strikinglycdn.com/files/fabfde6d-25ed-41ce-8c56-620773566461/juz_amma_arab_dan_latin.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_off0000ee2e.bin
599f204362ec14e1f44081cb19c2b15773459075a4f42106baec6c97275c5a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5188 bytes
font_01_sfnt_off0000ffc2.bin
8d367aee218edc9ad70693261540c2dc8d5609511c6372cc96f79ef96f2d7434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 11380 bytes

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