Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc3928f5d738215…

MALICIOUS

PDF

85.1 KB Created: 2021-03-01 01:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2f2f81f1dd09490d01b16032b7561b4 SHA-1: 486604e6f85fdbfeb25efaf4dea961791581068c SHA-256: 9cc3928f5d7382154b8a9b640c76c995721f86bd33bf17e82e791f18269e810f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to 'kuzutuzo.ru/strik' and disguised as a search result for 'how much does electrical engineers make a year'. This technique is commonly used in phishing campaigns to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=how+much+does+electrical+engineers+make+a+year PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403952/normal_5fdfa8b407d4f.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/aid09eK/tomcat_set_heap_size_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/j9jhaED/vida_saludable_alimentacion_higiene_limpieza_y_actividad_fisica.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/hiiajis/mr_potato_head_school_rush_game.pdfIn PDF document text
    • http://muwazowezijowa.22web.org/simplify_store_blogger_template.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/xieii6E/30076291617.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/jcgfRhg/my_talking_tom_2_hack_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/vevokegesibi.pdfIn PDF document text
    • http://begosene.epizy.com/aqa_gcse_chemistry_textbook_answers.pdfIn PDF document text
    • http://kipurifer.epizy.com/factors_affecting_students_academic_performance_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/sekisa.pdfIn PDF document text
    • http://rexonaboruli.epizy.com/kijizuvupora.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/ligegukikuzilowo.pdfIn PDF document text
    • http://sipukerafabule.epizy.com/steampunk_font_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/createspace_formatted_template_5_x_8.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E44 5572 bytes
SHA-256: 5d90457510338dca0743b512d2ef811a3d7b374fbe13d16e682c9740933fa2da
font_01_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 11044 bytes
SHA-256: f1e63fa5f61355219328c3f6acff11f1a2b415b9bd72b505456770a077e98193

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