Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b92395dbd127f5…

MALICIOUS

PDF

76.9 KB Created: 2021-02-24 10:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c9d58a910bb3730ae4e8dd764e7f236 SHA-1: 3e10f471b55ee0ff5a117b7e81359bfebaae233e SHA-256: 03b92395dbd127f54646924626c0a7f791d546723262107533a5d6ee27e39099
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to trick the user into downloading further malware or visiting a phishing site. The document body, though heavily obfuscated, appears to reference 'Toefl essay topics 2020', suggesting a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=toefl+essay+topics+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450156/normal_5fcd8a2ea37f9.pdfIn PDF document text
    • http://juligum.22web.org/67129107984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_600bba7861ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60149f0d842f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_60180c300a54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_602653b5ec6d0.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/38566910194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_6004d8e3475e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_60131937ef1b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5ff2a6b5a2f70.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/gezetega/jason_bourne_ultimatum_parents_guide.pdfIn PDF document text
    • http://jolafefiluw.rf.gd/46599129228.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/dokenaruxil.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/entrepreneurship_powerpoint_presentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/4386636295.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/gozabuwovazidikaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/technical_report_writing_courses_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/81403950291.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/google_sheets_count_if_contains_string.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/schengen_visa_france_application_form_india.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/marketing_mix_process.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/access_database_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/business_office_manager_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/kuvikusi.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 5236 bytes
SHA-256: cf4997aafea72fca5a2822126fcc7684092fb140bebb152b8f8822df73ddfa9c
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 10408 bytes
SHA-256: 5c16e51488227262b6a97e671607bae51f996903b4008c837471e74c28f8df8d

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