Malicious PDF — malware analysis report

Static analysis result for SHA-256 56410f93fd9415d2…

MALICIOUS

PDF

77.6 KB Created: 2021-04-28 14:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cacfdbcaeb136ebeb3da2ff92cda6c04 SHA-1: 5ebe0420df5395c3815ccb3e2b12ccd1ef3a3422 SHA-256: 56410f93fd9415d2b92652b66391bdffd90e30d5a3cb0368f89664329ed7360f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The document body, though partially corrupted, suggests a lure related to employee seminars. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=types+of+seminars+for+employees
    • http://meetsoda.pro/software_development_manager_salary_amazon_indiaoa5bb.pdf
    • http://vexasemigema.iblogger.org/30783538939.pdf
    • http://kikavixerag.iblogger.org/arduino_ide_language.pdf
    • http://bitunowaluf.sportsontheweb.net/55334135794.pdf
    • http://tisejamebip.sportsontheweb.net/javascript_ajax_get_file.pdf
    • http://woberenususasop.iblogger.org/xomokuzil.pdf
    • http://nout-prodat.site/830940113765gwi6.pdf
    • http://tofotibuwul.sportsontheweb.net/speaking_activities_for_kindergarten.pdf
    • http://vaborogi.22web.org/branch_manager_interview_questions_and_answers.pdf
    • http://genusadnlo.space/562763291421s10s.pdf
    • http://healthytrands.com/56504540499uxw3n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxexi/mapiki.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_90a67eb5e9654fb9ab9128448dec2190.pdf?index=true
    • https://acbe2b0b-ee64-4eea-b0ce-372b1aa9cc7a.filesusr.com/ugd/4bcc67_487e940f2eb54a8498400e910ca63a97.pdf?index=true
    • https://s3.amazonaws.com/fusopoxipo/81061274989.pdf
    • http://vuzuvasukix.epizy.com/21434221283.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b9a4bf6cad184f90884a0fa5af1756b8.pdf?index=true
    • http://derekage.epizy.com/business_project_proposal_sample_free.pdf
    • http://mibexumobanoko.rf.gd/vavogogafesokitikaruxipe.pdf
    • https://s3.amazonaws.com/nafamaragisek/44496943768.pdf
    • http://xusapibu.onlinewebshop.net/49588234418.pdf
    • https://s3.amazonaws.com/fazujo/how_do_you_change_the_battery_in_a_liftmaster_garage_door_opener_remote.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_off0000f36f.bin
742bb919c3a4f876b6026840ef93fd601f4550540e5e0fa1b699cc5a9365a797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5100 bytes
font_01_sfnt_off000104b6.bin
6a53bb3483aa879e5bf30f6dd2ca27694196014676b5608e4e936a13f7b92fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10680 bytes

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