Malicious PDF — malware analysis report

Static analysis result for SHA-256 48dbe816fd76db17…

MALICIOUS

PDF

81.8 KB Created: 2021-01-05 19:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 020a1d9071267931c83e08aad7882a7d SHA-1: 64a3c4474ca81c618f1ddddfb91a2f6bb7559a9e SHA-256: 48dbe816fd76db1766cf630c52502ff163e9655c1d9aacc43497a02fc2a36342
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=molarity+and+molality+relation'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

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://cctraff.ru/123?utm_term=molarity+and+molality+relation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_5fe956459b7c5.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/cjgvMib/87115097034.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/rLifRjh/24222877597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fd67412bd3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f88cd8e32ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5fab36b6e3894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_5fb9a2376bb5a.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/56b92cb0-3b37-4d70-b3da-6e47c1044853/fepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8557c94-0933-4c67-a561-7391e7adf5ba/65001679701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f3db90-620f-4f36-a28c-999d3521f500/halo_dmr_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bddba95-8e33-4971-8486-298b28a85f45/25778554473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72498463-5cf5-41c3-9b21-8027f7e82d77/xarononawegeronisaxuxel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9f3c6c-6a79-4064-931b-6bf96e32857e/tizegotitigatibizewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94e3e75-ee41-4cda-8680-712e3489a113/the_great_gatsby_questions_answers.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_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 4900 bytes
SHA-256: aa3d6802b6b745b1b3ce6ee7698ed3148de29aea2de888c5fccb3f53ea7b6f4a
font_01_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 12396 bytes
SHA-256: 2b0afd80b0bcc3f74e3d38c9a6ad3e80b197afab738be969c24d32d9d7d8b606

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