Malicious PDF — malware analysis report

Static analysis result for SHA-256 4811e0ac959bf297…

MALICIOUS

PDF

77.0 KB Created: 2021-02-18 20:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 467834c3ef36840e1a1a25e1f9f41423 SHA-1: 929bdc786a7d06b69dc797054595d00d4f38815d SHA-256: 4811e0ac959bf297ece26c417beb45db5bd3b48a0b284b1936f1f63aeafa61d9
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though partially corrupted, suggests a lure related to fixing an Xbox 360, directing users to the URL https://jacksth.ru/strik. The presence of ClamAV detection and ML classification further supports its malicious nature, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=how+to+fix+a+xbox+360+disc+tray+that+won%2527t+open
    • https://pojirada.weebly.com/uploads/1/3/2/7/132741169/zazijaduniwavil-nerakijutu-rasikirerado.pdf
    • https://cdn.sqhk.co/buruvalufe/weuifii/the_weather_channel_app_widget_ios_14.pdf
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5ff64e0f221eb.pdf
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/rigabapijiron-busilij-semosuzixow.pdf
    • https://cdn.sqhk.co/menekilebuz/xigjfie/wukexavijagixo.pdf
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/e87480fc.pdf
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fcbac6b0ce62.pdf
    • https://cdn.sqhk.co/mujexoxa/mighh7M/70164791820.pdf
    • https://cdn-cms.f-static.net/uploads/4454825/normal_5fd68b45de9d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxegeza/nifedojep.pdf
    • https://s3.amazonaws.com/fedojigudaj/flight_pilot_simulator_3d_apk_mod_revdl.pdf
    • https://s3.amazonaws.com/wamatasamegu/sql_database_2016.pdf
    • https://s3.amazonaws.com/mujesogi/37414026512.pdf
    • https://s3.amazonaws.com/nutanigonu/which_washing_machines_have_lint_filters.pdf
    • http://zerakunutage.epizy.com/arma_3_mod_apk.pdf
    • http://tovajukoxeboder.epizy.com/bumutuzokilu.pdf
    • https://s3.amazonaws.com/tajimipojimo/apache_vs_nginx_performance_2019.pdf
    • http://surafupomef.epizy.com/blend_for_visual_studio.pdf
    • http://lilufafuf.epizy.com/11769602351.pdf
    • https://s3.amazonaws.com/jeworurowam/online_android_app_use.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/veruzebezeregawup.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_off0000ee2b.bin
3dffe2b01a60d4d05b55e05881896927ee3139639ca117321ec6c148ac964081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 6068 bytes
font_01_sfnt_off000102e5.bin
cdc6cad0f26e18f17c18028b462dc9d739edf084038062dfa529ee658c570e37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 10468 bytes

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