Malicious PDF — malware analysis report

Static analysis result for SHA-256 e366bcd5385a785a…

MALICIOUS

PDF

76.5 KB Created: 2021-05-06 12:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 386ba61bd3d666e2b229b3e581b0675b SHA-1: 945d969f2856d342239095f2f6ef247367c8e785 SHA-256: e366bcd5385a785a1a7658487142206461f8c0cddaf4b45a8bafa5f806154c85
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'vilenefex.ru', which is likely the primary destination for the phishing attempt. The document body presents a seemingly innocuous question to trick the user into interacting with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=which+of+the+following+is+an+example+of+verbal+communication PDF link annotation
    • http://reform-st.ru/what_does_gre_percentile_mean8rxb0.pdfIn PDF document text
    • http://geekcods.com/romenobeludalajek6wkcn.pdfIn PDF document text
    • http://doordash.fun/alfajr_clock_city_code589i6.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/ralepokoxexokedaga.pdfIn PDF document text
    • http://batmbatm.ru/p1421_nissan_versa3jbxx.pdfIn PDF document text
    • http://retys.space/xopowilusaviwotxenog.pdfIn PDF document text
    • http://mon-cmbretagne.com/winifiziterisojizeioeq8.pdfIn PDF document text
    • http://urro-hu.com/delete_watermark_online_freeulw7g.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/el_alcoholismo_en_la_adolescencia_causas_y_consecuencias.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/resisuna/black_ice_fennec.pdfIn PDF document text
    • http://duwamiwimi.rf.gd/80854800230.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/2501907271.pdfIn PDF document text
    • http://wekijedi.epizy.com/37794544653.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/kobozadilawogotelu.pdfIn PDF document text
    • http://kiziked.rf.gd/bsa_merit_badge_pamphlets.pdfIn PDF document text
    • http://tevetozenirok.rf.gd/american_criminal_justice_system.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/padafupo.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/local_breaking_indiana_news.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/microsoft_certification_path_2019.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 5804 bytes
SHA-256: a603f34fa387fc2de7a1b4bd2e15c5b7922b9bacaaab8e0c6ed417a8e271eba9
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10704 bytes
SHA-256: 78bab9d1d40fc0ff0b4ce6d790dd17cc10a68e3963ae20de6a6e8a71ba9c112e

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