Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ddef880f3571bf…

MALICIOUS

PDF

79.8 KB Created: 2021-05-17 12:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c06c8b93fa057cdf6d66143d6367e1 SHA-1: 155bc53b025893e578888e385c953ae85d34fa9a SHA-256: e0ddef880f3571bf372f50766ba06023b86b2cdd22998a64e366839fa76a1814
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL identified is https://kuzutuzo.ru/strik?utm_term=compare+and+contrast+essay+topics+grade+4, which is likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=compare+and+contrast+essay+topics+grade+4
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/21708e.pdf
    • https://cdn.sqhk.co/zikegasenar/igdhbr8/zagezuvida.pdf
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/5182741.pdf
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/sevadagefus.pdf
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/zamim.pdf
    • https://cdn.sqhk.co/felolavap/hbJhdKo/23916138142.pdf
    • https://cdn.sqhk.co/fusajovogi/OheT4tO/ios_14_lock_screen_widgets_not_working.pdf
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/fibelegutekudib.pdf
    • https://cdn.sqhk.co/wefonasifaza/gjL4hhi/watch_shelter_2010_movie_online_free.pdf
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/katamabepazejo_samujinufov_dimodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wipitawakewemex.rf.gd/61483001038.pdf
    • http://wifepex.rf.gd/brother_pe770_for_sale_near_me.pdf
    • http://jelenexej.rf.gd/tutorial_bizagi_espaol.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_c5aefb4220a0430488a195f8be5f9792.pdf?index=true
    • http://dinikuwaduvo.epizy.com/propresenter_6_supported_video_formats.pdf
    • http://sufazomewugexu.epizy.com/pevolukojejutawiruniname.pdf
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_3583a708ba264ab687b4106eb02c2c5a.pdf?index=true
    • 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_off0000f99f.bin
c6a9c5b69e1853ccf15c090ad9805773aac0a7328014515375f093770152a68e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 5456 bytes
font_01_sfnt_off00010c20.bin
4eb919b56847c3aa32fecd6c584bd79288e69d6a26e0b188cb48922c2a7613e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 10800 bytes