Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf38b978388b53a…

MALICIOUS

PDF

78.1 KB Created: 2020-12-28 07:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 54704b67ec8cac4c60355fffac47dd37 SHA-1: 2ccafb44a88ed602ab89af0236d7d8e07dd8b728 SHA-256: 7bf38b978388b53a102134ac7f17b674eedccf1b8bc37696740b3e98d03b0e66
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a business email compromise (BEC) attack, aiming to trick recipients into believing there are new payment instructions. The embedded URL, 'https://traffset.ru/strik?utm_term=nickelodeon+slimefest+2020+blackpool', is likely part of this redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://traffset.ru/strik?utm_term=nickelodeon+slimefest+2020+blackpool PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5f96ea3ae6a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f903a109b1ed.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/Ghbgcgg/teaching_job_interview_questions_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_5f92801e33cf2.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/bgjijgT/karujiwigagazisolotaperu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5f8ea7c7d2368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fe8bef1c2bea.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/fYgdM6x/17955052329.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/Sdlz6Kt/bipavewumesivepitig.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/A3UijN4/fajirejukariribamegadeseb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zesixefe/76935890750.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 5440 bytes
SHA-256: a25d7bd1e9e526b1dbd4497461bb447c82c18cb49fafaedca134304844dfa5f1
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 11568 bytes
SHA-256: 0da6596fdd2fc41fb4aae3fb68181c56fd15f0fe0407a0540d7e246583fb1f78
font_02_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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