Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1d2c6af49a4fa9…

MALICIOUS

PDF

81.4 KB Created: 2020-12-11 13:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: da82ffb4e8436945aaadc3adc623ca6a SHA-1: 8e80f2e9f11c1a03e1d4585da42265c7cfa43ac1 SHA-256: ca1d2c6af49a4fa90ee91316e4c2b5aec84ec1d8fd5104b7b88f5b86c5d295e9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'Yiruma maybe piano sheet music' to entice users to click the malicious link. The presence of an external URI and the ML classifier's high confidence further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=yiruma+maybe+piano+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5f9d0e1ed5f80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5fbefee9e1a83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5c9115e8e827d42af5a10/t/5fc64f484e98326c02e88461/1606831946054/22607135142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdfd287-2ae1-4466-ab41-7c49eafa5366/fopukon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8861877d-40b7-4e9d-b6f8-482a62cddcd4/jobezirusaxevivamirof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb82efc9-8d3c-43af-995b-56633ce0d801/83044227846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bd0749-36f2-4595-8201-1881cc4152e7/algebra_rules_of_exponents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/nano_sim_to_micro_sim_adapter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/formal_email_template_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1170d16e-4bfd-47b3-86e9-03e705fea815/nojotene.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc16b11c6229360ecb0a135/t/5fca85f73162606f7d2846c3/1607108090267/xifusepaguxibov.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 5344 bytes
SHA-256: a534a8340dc32690a89c2aae3a43f8dbfea3546f17ce23efd2b8e2495dc81c9b
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 10828 bytes
SHA-256: 291c1d32d36ac41b80f54bf76886591d54a37d33a47ef02fc6a38a365127ad41
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16100 bytes
SHA-256: d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6

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