Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8286f35bfa39fb…

MALICIOUS

PDF

71.2 KB Created: 2021-05-18 21:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af0d3c1d2fe0bedce21ea1ae5e5c13f SHA-1: 228b67c8505f976be7100ee43d3aebad51190ff5 SHA-256: 1c8286f35bfa39fbfcd831dc18c263c0bfd83b7748d87c308c22893f7dd7a0b6
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests an attempt to disguise the malicious nature by appearing as an academic resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=lexemas+morfemas+flexivos+y+derivativos+ejercicios
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fecf43d81202.pdf
    • https://cdn-cms.f-static.net/uploads/4418981/normal_606aafc801799.pdf
    • https://cdn-cms.f-static.net/uploads/4475719/normal_605448afb268e.pdf
    • https://cdn-cms.f-static.net/uploads/4495065/normal_606e370fbee12.pdf
    • https://static.s123-cdn-static.com/uploads/4481273/normal_5fc7d83c790d6.pdf
    • https://cdn-cms.f-static.net/uploads/4446166/normal_6061df78c6ff9.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_601d6b295906c.pdf
    • https://static.s123-cdn-static.com/uploads/4369179/normal_6008823ab6117.pdf
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fee47437d28a.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_606338b69ef85.pdf
    • https://static.s123-cdn-static.com/uploads/4491152/normal_600350011a08c.pdf
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5ffbd869aaf64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nojatajof.rf.gd/love_whatsapp_status_mp4_video.pdf
    • http://virojokezof.rf.gd/xubekosufumobija.pdf
    • http://jozorawoma.rf.gd/18391861187.pdf
    • http://siduxosezuk.rf.gd/pifiwexub.pdf
    • https://s3.amazonaws.com/zesotat/1648274662.pdf
    • http://gugujis.epizy.com/how_to_factory_reset_disabled_iphone_6s_without_computer.pdf
    • http://vivizegijarugip.epizy.com/oscar_wilde_short_stories_download.pdf
    • https://s3.amazonaws.com/dinilederu/all_pll_algorithms_3x3.pdf
    • http://gobozukelawi.epizy.com/wajasinubopa.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_off0000cb2a.bin
0ea9ff22539f32817611ca86ac61cb349e0552b696f84ee1c3301c305f5a222c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 5096 bytes
font_01_sfnt_off0000dc96.bin
00d38475e1e552f2760a5dc37cfd6dcf9dad659b2a1f0624bb0b7608e025018b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 11076 bytes
font_02_sfnt_off000100c0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 4324 bytes