Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf4bb733a79cab8…

MALICIOUS

PDF

69.6 KB Created: 2021-02-13 18:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 617ba0669f7b65e2a034b98919b1dba1 SHA-1: ac4bf1a94c74a7f1267b4f93b0be70befe418b5d SHA-256: 4cf4bb733a79cab8c71a0a84698d79bba4b1e979a7259a6b311a4967e5b91516
96 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The presence of an external URI pointing to 'leonvi.ru' suggests a lure to a malicious website. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=philosophy+kindergarten+definition PDF link annotation
    • http://drenajkrasnodar.ru/tamasalenijowapuxojixi0vf8.pdfIn PDF document text
    • http://vetodegaro.22web.org/34521789911.pdfIn PDF document text
    • http://probmake12.xyz/castle_defense_2_mod_apk_rexdlyotgs.pdfIn PDF document text
    • http://iciapp.xyz/ansar_sheikh_marksheet_upscnv3xx.pdfIn PDF document text
    • http://siteznakomstv69.space/68307052437l7pog.pdfIn PDF document text
    • http://unityfree.xyz/87523924975y6n4t.pdfIn PDF document text
    • http://xsafak.com/15214642833nr3xn.pdfIn PDF document text
    • http://arenda-comp.space/532669706084og2y.pdfIn PDF document text
    • http://detonic-italy.website/access_database_templates_2010u8tes.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/barber_shops_open_on_mondayadymi.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/kitakilesa/8890506177.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/esl_worksheets_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/pixulawon.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/cabin_crew_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/fawevotaw.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/java_simpledateformat_calendar.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_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 5468 bytes
SHA-256: 0a4e8b3e7780d67684bfdbbfb0a0b14ff25b768bcbf2945045820a8f70ebe834
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 10832 bytes
SHA-256: 9a7e2fbe81a5c9973dd72302d4c719a0195e33d0288294a4b62c5711c3c3c8fc

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