Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67b4f5d7516c8aa…

MALICIOUS

PDF

75.1 KB Created: 2020-11-26 06:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cada1c0a937f346aeb1bf3d3f172cdc0 SHA-1: 907634cd07e8248b8f08858a7124510817a1554a SHA-256: b67b4f5d7516c8aaf6aedc80f32204f40661e766726ed4b932c01f4f0f2c8143
156 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. 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 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
  • 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.
  • 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://traffset.ru/strik?utm_term=funciones+exponenciales+y+logaritmicas+concepto PDF link annotation
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/4893388dac3d.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/d33e80e3-6562-4d60-ad41-719c87936aad/67451724947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d625c3-5614-4666-9133-a45a5b8805d1/kefom.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/wesafebekuxukipobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13c25ea-caf6-455b-ad4b-04fa540546f0/dada_vs_surrealism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d344a911-d5a8-48b0-a397-acbdc284496b/luzisujirikawinidaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6812126f-3b2f-424e-827a-b424a0e4dfdd/40088267364.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/propiedades_fisicas_de_la_materia_cualitativas.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/fijepim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1347380-1cfb-43b8-b44d-622b9bea81cd/pamididibezawawiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050b4f8c-9992-4dd7-bb8f-0750f043bdcd/85546214802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fd0dbf-cc5b-4eb8-9d17-f61ad2f02c93/5543559923.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/45866081324.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_off0000c124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC124 3120 bytes
SHA-256: 750d1396ea0bf5fbbfb1efa7800930e25a2e400cebbc542b316d66b1e2c172b3
font_01_sfnt_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 5380 bytes
SHA-256: 99626e693a0d9aa56eea32e3c93b0a7dc07cab29ebb59ac16c0f72d53808370f
font_02_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 12492 bytes
SHA-256: 41dbd097ab60df8baf731126e9efae51a6b88309e7e89124f2a067b4893180b0
font_03_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 16116 bytes
SHA-256: b0121a4862cd28a2988d5446182d8e0ca983740763aa9caaa10bd706df185dfe

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