Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86bb7596bb17433…

MALICIOUS

PDF

81.0 KB Created: 2021-05-22 22:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c408cd76e9beb65b46fbbef8b13c2b18 SHA-1: 577f6b2d762301896fa43191771175fd033ca7e4 SHA-256: b86bb7596bb17433c5fd5fcbba53ff67a19d7604de866bd9faf96151e373c361
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation 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://soxebez.ru/strik?utm_term=resenha+do+livro+o+que+%25C3%25A9+educa%25C3%25A7%25C3%25A3o+carlos+rodrigues+brand%25C3%25A3o PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475863/normal_606432eaef87c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fc5e65adb5f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405674/normal_5fdeae5e99a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_6022fa9162ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_603d6621bfe9a.pdfIn PDF document text
    • https://paninopuj.weebly.com/uploads/1/3/0/7/130739529/bugajonu.pdfIn PDF document text
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/d0614e4e4e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_603a0b43b9e26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5fe43dc5c1ddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452154/normal_5ff292458d739.pdfIn PDF document text
    • https://jeruxonoja.weebly.com/uploads/1/3/1/4/131407493/wekuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_60133e4fab8a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_60086ad57d3cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09bab651-10e9-4e33-8211-650fd0f17d13/jolees_dark_transfer_paper_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0198f7-15e5-41d0-897d-3a7a4473735a/75484217281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963f4a7b-f54a-4b91-87ba-0a7c692c0c12/how_much_does_it_cost_to_have_a_new_exhaust_fitted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666b61fa-27b7-41f6-b1f2-efe63fbfe22d/c_programming_program_design_including_data_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a61a40-8695-4942-8b0f-5d4299d2ec9c/niveles_de_lectura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f03dfe7-31fc-437a-9268-ae638f6838d5/nebobabizurejojigedezemuw.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_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 6176 bytes
SHA-256: 5ec2922dec1e13af798030866fb23e7adc31050ff1e9dfda1f6915cf4fce5d7a
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 12652 bytes
SHA-256: 7036feffb0692e8c94b56bc63520f5056a0204a8f64cb3cbc3a1eba1bf70acfe

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