Malicious PDF — malware analysis report

Static analysis result for SHA-256 26920a1d2ae39bf4…

MALICIOUS

PDF

85.6 KB Created: 2021-01-19 09:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b40438ea09c88be171c062dbee724a4d SHA-1: c2cda8eff6a15cc4589ad095aed65ea52648438d SHA-256: 26920a1d2ae39bf4ee49401005aeb0bf29d2fd1ebc0a4d1d5c8f6ee5d0b8d54f
154 Risk Score

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=oj+if+i+did+it+pdf'. This indicates the document's primary purpose is to redirect the user to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=oj+if+i+did+it+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fa037c5ef202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5fd040268737b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_5fd8466e06ffe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5fcbd858e6588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fad97b72fed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5fc04dce154f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6369771e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5f94cef190491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fd6631013898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381291/normal_5fce47dc64eec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5ff50a4281cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f877460be94c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fe23134f3cba.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/vuxagixil/lawigumuf.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/english_grammar_worksheets_for_grade_4.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_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 4624 bytes
SHA-256: 115a95ffd0468fe27ab011d722592503fc821c2c96f085ea189f28c7606add81
font_01_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 10628 bytes
SHA-256: d4f90eb0894e038399b679613d3e10ce2dd68d99320300ae00fb7e8e85b643ea

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