Malicious PDF — malware analysis report

Static analysis result for SHA-256 955caf4090b28da5…

MALICIOUS

PDF

70.0 KB Created: 2020-12-06 17:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2513d967759a4e49d0ec2027884aa502 SHA-1: 5a33285e22706fc508e20318071b17228e5c2c05 SHA-256: 955caf4090b28da5979b0a3d9caa72c2f552941864505fa2a5c71c837768be19
154 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=is+has+a+verb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5f8c3b63a3c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5f8eb610ac49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8cc8d5ee7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_5fb5cf25d3bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f9d189c7fc7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_5faf3ebf87344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5f919e6b4abe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fa6fd929ff7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fa9c18b589f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb45328b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gajabedafot/58132830296.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56aa3ea4a794d56637c79/t/5fc72b5d48d5672cfb399099/1606888285654/ncaa_football_national_championship_2020_tickets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55163d49dd124475193a8/t/5fc7db9c6d2b7b26a14f7f00/1606933407361/gta_5_modded_lobbies_ps4_2019_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/backyardigans_violin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a053aaa5-9c84-4d49-9a14-1b61771a2116/61590039066.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 4324 bytes
SHA-256: 832e0e07c0b23b5861552e0922d1fe88aed89780c1f88411a95b66291886807d
font_01_sfnt_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 10448 bytes
SHA-256: 7217d7294f468ecc4ec660f1a553305180845b0f80d1e424b0e9f417b9808156
font_02_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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