Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf21400ba741fe3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-07 00:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8c2d691855c1e689c18b32b6ce14d5f8 SHA-1: e7e8f7b98c4560b1c98a425879a5ebf2bc18040d SHA-256: 9bf21400ba741fe301bd5d8343ce9e0a7a5370e67ce615a7f356104855471dc3
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary one pointing to 'vilenefex.ru', likely serving as a lure for users seeking educational materials. The document's structure and the presence of external links suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=math+algebra+questions+and+answers+pdf PDF link annotation
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/wisurovibux.pdfIn PDF document text
    • http://wide-do.top/dermatomas_y_miotomas_actualizado3exea.pdfIn PDF document text
    • http://ratebekanolaja.22web.org/tezunadejivegavudapinazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407988/normal_5fee8a0b2a4f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365636/normal_5fce34a06403c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5ff32bbd05aa3.pdfIn PDF document text
    • http://familyit.pro/dash_diet_for_weight_loss_menu0v2m6.pdfIn PDF document text
    • http://wapuwesifatirok.iblogger.org/nekikixiwixubolur.pdfIn PDF document text
    • https://dagojamigim.weebly.com/uploads/1/3/4/7/134763314/4316f43.pdfIn PDF document text
    • http://vinnipoh.space/how_cars_work_newtongyedx.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/neperolapo.pdfIn PDF document text
    • https://borojixupoluba.weebly.com/uploads/1/3/5/3/135316148/fejogi_lenadu_lifokuxufiv_lejutunasovid.pdfIn PDF document text
    • http://hesap-al-sat.com/how_to_learn_electronics_at_home6oixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_6035a692bfd14.pdfIn PDF document text
    • http://vykupavto54.ru/bokixeroq0jxn.pdfIn PDF document text
    • https://pukunave.weebly.com/uploads/1/3/5/9/135957849/lizirotovijivasozadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_602c689edd635.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juxuvirorut.epizy.com/10940199712.pdfIn PDF document text
    • http://wegewid.epizy.com/how_to_read_aviation_weather_australia.pdfIn PDF document text
    • http://mevediruzorapaz.rf.gd/alpinia_calcarata.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/80903359852.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/calendar_design_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/bosch_exclusiv_duo_system_fridge_freezer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/2335500173.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/nojeperiro.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5668 bytes
SHA-256: 157829ef5df3416d02ccb47a4e2b0407a7f55c02a7f1e7bd32b90943975ab31e
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10884 bytes
SHA-256: 11afcddf9b0421bc29fd7564dbcaac28aac5c10a7cac161b20933e50c64e7a1f

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