Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4a63b8a697d85e…

MALICIOUS

PDF

81.8 KB Created: 2020-11-28 08:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7d383100e5a17e1a78ef79de37f2a4fe SHA-1: da243a5793a6d51cb07beb7d45e6f317d7866be3 SHA-256: ba4a63b8a697d85e682df14c85fec6ae883b5d74282a4a69eb7fc4d2b698a1df
196 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. It uses a password-protected-archive lure. 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/strik?utm_term=edward+40+hands+rules PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fbd29b155f1e.pdfIn PDF document text
    • https://dudixojazimonam.weebly.com/uploads/1/3/4/6/134638097/5230411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_5faf51d86bc03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5f989d844d8e5.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/2446fef6.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/nafoke-nonizijon.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/a6d3e87a-ff3e-45ff-a99e-3936112c0041/46509007199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249ed2b3-7c8d-4146-b770-b794019372b5/karate_kid_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2165fff8-2957-4b56-b9b4-c1d888208664/super_soviet_flash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfe5be1-9a34-475d-8920-66917dcae4d7/26331508264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e8570a-b3a5-4fe9-871a-5cbbfca5b163/bs_en_15048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93badf3-84ef-46d9-847a-eae2a3f2de15/caracteristicas_y_funcion_de_las_antologias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8ab251-c62c-47f6-b21a-0f5c901f71c7/sopafovuvitaralilizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c5f41c-dc4f-4c22-bc40-732b25089f65/zudukadevumuralonurifex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 5192 bytes
SHA-256: ca474495dcb64a1fd0ee7bb109b75f0aa5ce920eb5bd8204078b5e1e6a290e2d
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 5896 bytes
SHA-256: 3549ee16b59f80f748c9d9776a26b8af411f0bb3f7fba82434e2b6162126b13a
font_02_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 10908 bytes
SHA-256: 49e02bc03097a1419d3d5e1bd850cc83edff2b35ff4fdafd37c6b631da9cf622
font_03_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16240 bytes
SHA-256: afc0ac5680b934d816146eec9a2a66b8c857160bfd2fa2561a77004291283b0c

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