Malicious PDF — malware analysis report

Static analysis result for SHA-256 08845c5228945c5b…

MALICIOUS

PDF

80.0 KB Created: 2020-12-17 06:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 265607eb4ef263d05f2de50271455974 SHA-1: 961ce729096762f7b4df74fe5085e1d7bfd370af SHA-256: 08845c5228945c5bb3bcc33d1bed41aaf8261073a7ea04f2f7a8de0e8ef5958d
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. The presence of a visual download button lure further supports the attack pattern of tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=merge+excel+sheets+with+different+columns PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446270/normal_5fa02070c6dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fcbe5984c33b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fab210aee66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f879fabe7ac6.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/5fc1c454-e9b3-4224-b5fd-a82435d1b5f9/principles_of_biochemistry_lehninger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6fc9b5-8d84-49bc-91fb-501f935dceb3/22682424978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2fc07e-3b96-4569-b4ff-33b3099fbb13/laxunowaxozugagodufinala.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65fa411f6a41984ab0936/t/5fca94a7df388c3a04bf2e50/1607111847634/tefexizowekawaroror.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe6f149d7936484060875f/1606315800315/period_definition_physics_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5506ab8467722f1f11d37/t/5fca965d4780a777057b3d58/1607112287439/26993073538.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_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 5388 bytes
SHA-256: 88b985e2b3ed57dbd7325a72b4a9ebe4009d2bf01d5a8ebb9e21d15c3bec54d3
font_01_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 11272 bytes
SHA-256: 4139bb700194990c3a4e20259eadbe1d51953039884c864ef0a3ca2cab942c24

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