Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8a5d1cca222c6f…

MALICIOUS

PDF

69.2 KB Created: 2021-01-08 10:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dd49daa66d02741791d765d345d1c46b SHA-1: 0de58957444c3d4bc877c225aec162ec0f8e04ef SHA-256: 5f8a5d1cca222c6fd2c3395c9a7b975f1faa0e3aa1ce1a7c8157942c75a3eb24
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=how+are+you+in+sign+language+nz PDF link annotation
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/d9d3b34aae.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hhih0t0/zevogekapezebodapaniti.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/Kcbgjzi/lightroom_border_plugin.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/67d2d1.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/3b5b33df65b.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/60b0c635-cc88-4941-b9d7-6aeb934b026d/lojidirepofapelofigevop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39caa7d5-e7f1-4d61-be13-58257e7a4ab2/76259794267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6544ae8-07e7-44a3-bd8e-38a4b33a1d49/castle_defence_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/free_employee_disciplinary_action_form_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdb74cb-97dc-49b9-bc82-4bca14da3c9c/5_conceptos_de_economia_con_sus_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f2da40-eed0-497b-8f6f-f4f78820b989/pogetipekimuwuwubakire.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_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 5060 bytes
SHA-256: e9f5cf65b5a35c5d7466da74e694d85eb5b87a606ea260c29f72ca2e7ca46bf4
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 10456 bytes
SHA-256: 5c8ed61687e8bfc4991be6faa12f9bf5b2938e5129eb9c970d9e6118af922098

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