Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdc94c861b4e4bf…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 01:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ced1f12f52dda9483224589f069d3942 SHA-1: f1c18cfe6cfb959cd19499395234c9da43377ba5 SHA-256: cbdc94c861b4e4bfbb334a7cf517cac28e80987047a39ebae92676ef0f541907
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded external URI pointing to 'https://seumenha.ru/award?keyword=how+does+buffalo+buffalo+buffalo+work', which is likely a lure to a phishing site or a malware download server. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

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://seumenha.ru/award?keyword=how+does+buffalo+buffalo+buffalo+work PDF link annotation
    • http://healsmall.space/ansel_adams_books_freea46o2.pdfIn PDF document text
    • http://chambreop.xyz/546700677087gp2x.pdfIn PDF document text
    • http://winoraama.website/beyblade_g_revolution_game_apkpureok2xk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_60192dee191c4.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/94527942994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_5fd111ae9784f.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/the_long_haul_rodrick_funny_moments.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/93559289932.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/craftsman_13_planer_parts.pdfIn PDF document text
    • http://servempieza.site/22511346361bxahj.pdfIn PDF document text
    • http://copyright-security-ig.com/sample_progress_report_comments_for_preschoolq52uz.pdfIn PDF document text
    • http://keepxufi.space/rilesubirijiis8xs.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/mujekox.pdfIn PDF document text
    • http://pycnidwzxc.info/14466209350ehgpq.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/setigafat/marketing_and_sales_strategy_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/jurnal_nasional_budaya_organisasi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/odd_and_even_numbers_worksheets_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/payment_request_letter_to_company_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/sisunerasasifibala.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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 5156 bytes
SHA-256: 4217ceec7844665d59fef4b6d3fcf63dc6549d7658f3abe96d481e0367048097
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10472 bytes
SHA-256: 273ccf538df9ff02e59ba7a05decbce4ca7471ec8fb1693998368068fa5f12ee

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