Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8021f2d090c2ed…

MALICIOUS

PDF

67.6 KB Created: 2020-12-21 00:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 54c77c039b43cb0ec6a7225d4facd979 SHA-1: c3e713431288fe7ddb1ef8bda1563613147d0c01 SHA-256: 4b8021f2d090c2ed2fba8089fd20984aeb0ff730caae0d4673710e27410cd382
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file, disguised as a course description, contains an embedded URI pointing to a suspicious domain. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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://trafffi.ru/strik?utm_term=strategic+business+analysis+course+description PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455183/normal_5fbb62ba2bfff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5f9350ec7c135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fad3b8606f40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fc91f8745e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_5fdb518fbc354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_5fa5050fd87c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5fa3ec0742377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5fc38d3459461.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/6d6c3e08-21f0-450b-8b9d-8c5bdc539ace/girls_und_panzer_ova.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2c3c5b7bc966055df3f1/t/5fdd6d38463d3b6c6f1f226a/1608346937231/35285529858.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffbf92e34347c703edab4/t/5fc37b179b1ed0353849b2c7/1606646552158/chemical_reactions_4.5_stoichiometry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/25693135511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f4a80b-d9a1-4fe4-8903-c04171bf3764/83739195522.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/lazuki.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_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 5588 bytes
SHA-256: a8852664cbad907b544a1697f12cfc94fc389ef411bb78af87edf9413162da96
font_01_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 9752 bytes
SHA-256: b050eee2d0e5fb51417e5b7d3662276f020328093db744a2c9701ce7aaec8252

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