Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4036103e5804941…

MALICIOUS

PDF

76.7 KB Created: 2020-12-22 03:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d18fe15921d092ff5dd0a2d6438555c6 SHA-1: 07ed3e831606719f91810447765ff4ac614cff95 SHA-256: a4036103e5804941714fa9ea94eba28380165ba93081b63bacbeef95408a6e4f
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/wb?keyword=expanse%20book%209%20date'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests a phishing or malware delivery attempt.

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/wb?keyword=expanse%20book%209%20date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f971952d6eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fd643b248088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fe1240ec0c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_5fa788acea677.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/kuxuxemu/tirazowedos.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/nozesage.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/23379149788.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/business_environment_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/words_the_start_with_hypo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc38d9f2-f1fd-4807-97a1-bffcdc30418b/47395860408.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/91855144101.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/gukinu.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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 5212 bytes
SHA-256: 5c42a957bab9dfccbd24b9013eb51a120be9c475f90878c8aa07cd62c34aa161
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 11640 bytes
SHA-256: 63c194434a691d95c1c4fceddd1cc7aeb65376003f68a63cba5fbc7b011575da

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