Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c5d9170a1a160a…

MALICIOUS

PDF

59.9 KB Created: 2020-11-13 15:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e068c13f8d917943e7ccd974fba22ffe SHA-1: 91329252b8ae6b5e6775576e90dd22cc82f9638a SHA-256: 51c5d9170a1a160ae151230b768c144c9ad2a76056c49635f81cf90d3c8e7b8f
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL point towards a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/aws?utm_term=clinical+anaesthesia+viva+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fa3c358be301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5f9bd2c182a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5f93dd49607b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5f92460a3c1d3.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/mibiwivanetuj/nivumekalageledafenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252e6462-0acf-4bf9-a9ab-6bd5678ada82/58442817182.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/76290705869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5986349-8add-4c30-b187-43c7247ccb05/90322987066.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/30948453281.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/dyson_ball_vacuum_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/motesan.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/remenabi.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_off0000ae0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0F 5316 bytes
SHA-256: cd2848cad065d0cac1347c3a14511ce90999da6c9c91be34bd4e0712c569333f
font_01_sfnt_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 10196 bytes
SHA-256: 7b4c6ee369652fadadf83f1cf57f0f91973d332fcbea329b6a4e8344897e8fc6