Malicious PDF — malware analysis report

Static analysis result for SHA-256 f877c8efc33729b4…

MALICIOUS

PDF

73.6 KB Created: 2020-11-19 03:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2225da4ea1f54fc3781588e61d3c54a4 SHA-1: b6ae21b9cff5c64cad151063778f8e5fc6049070 SHA-256: f877c8efc33729b44aad92f4e0696158a39e0bd0f5a27de3ad86a632dc7f2852
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URI pointing to 'https://trafficel.ru/strik?utm_term=partition+debutant+piano+num%25C3%25A9rot%25C3%25A9', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI are strong indicators of malicious intent.

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://trafficel.ru/strik?utm_term=partition+debutant+piano+num%25C3%25A9rot%25C3%25A9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5fa58f8f7e0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fa897251264a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f913a0d888bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_5fa7a2948adbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f87461db06fb.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/xupizewuxere/64984687027.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/kamus_arab_indonesia_untuk_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac54ed87-095b-470a-bbe5-69e49224807d/bakipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e198e0be-50f6-4a55-ba31-0b69fec09480/88817777437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ed26e8-11b4-429d-ba98-19fb00eb81c5/novediru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d0ed45-6162-47f6-9722-0925dc675e6f/tigewusotepidolofalaxol.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/anthony_bourdain_cookbook_new.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1e5ea0-0b8d-41b8-9fe2-12ed5c9f3b59/cracking_your_genetic_code_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03841ce-476b-46af-ba04-0ee86e54ac12/12620022451.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_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 5176 bytes
SHA-256: bfaa87bb1974043ac861e76255e647ad764651784b98ed3bbb99de57216ebd6e
font_01_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 11808 bytes
SHA-256: 9a326e3fd088208018f4dd8c878ef959bedf09e4fb48b1c5eb8366df30c7b88c
font_02_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 17788 bytes
SHA-256: 50db4867b648fb14dc2fb2171a6cca195bd8e9b88c56824ff7308623e8a9c6a6

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