Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a558ac2cba0a764…

MALICIOUS

PDF

74.2 KB Created: 2021-04-06 14:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40ffc738fe17988a6a273c009d8c7959 SHA-1: e09cff8dc8f28196fd7d00348e2842b74cb32860 SHA-256: 6a558ac2cba0a764dc9646b5f21af1af801e219ccef8126480d2c826a07704cd
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests it might be a lure related to chords or a similar topic to entice users to click the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/wix?keyword=doom+despair+and+agony+on+me+chords
    • https://cdn-cms.f-static.net/uploads/4406455/normal_60699cc41a35e.pdf
    • http://vasakuso.sportsontheweb.net/72682701267.pdf
    • http://pewujok.mypressonline.com/23906386760.pdf
    • https://cdn-cms.f-static.net/uploads/4483365/normal_606340614af22.pdf
    • https://cdn-cms.f-static.net/uploads/4488822/normal_6041db3f97d1d.pdf
    • https://static.s123-cdn-static.com/uploads/4454184/normal_6006f421e6f03.pdf
    • https://cdn.sqhk.co/dutimapo/jDgimLz/romantic_movie_date_night_at_home.pdf
    • https://cdn.sqhk.co/juxezijafoz/iifkj0D/raleradazudexowe.pdf
    • https://cdn-cms.f-static.net/uploads/4404965/normal_603c5c14cf9a9.pdf
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5fd1c91e20e57.pdf
    • https://cdn-cms.f-static.net/uploads/4475854/normal_60364fa1113c6.pdf
    • https://cdn.sqhk.co/jatobeguji/Splhaid/74341141063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gixejemazob.myartsonline.com/reliance_annual_report_2020_19.pdf
    • https://s3.amazonaws.com/wexoteluwag/work_week_calendar_template_september_2018.pdf
    • http://talanusedos.epizy.com/68470338173.pdf
    • http://porumujowupof.epizy.com/discord_formatting_syntax_codes.pdf
    • http://tuzuxutetug.atwebpages.com/6431844093.pdf
    • http://fukuselumetu.myartsonline.com/is_cfe_certification_worth_it.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/us_intervention_in_latin_america_documentary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ea.bin
6a3b9965be88389e58f312af16aa61254fc14abf61e3c497b43ec5129074eef9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 5264 bytes
font_01_sfnt_off0000eaa1.bin
eb14841bd6d9fd50fe13b679116cd89078c8365a573af05e6478f34a5274d667
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10568 bytes
font_02_sfnt_off00010edc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 4324 bytes