Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52099000cb45d8b…

MALICIOUS

PDF

69.4 KB Created: 2021-02-04 05:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 95deda8d45eb6960508360d3642e3755 SHA-1: cf89f79c4a8ad7bd543a3d31f4e11a91d37809dc SHA-256: c52099000cb45d8b23a48ca73b326c862da22bedfb5033359b52b47cfce48c92
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classification. The embedded URL points to a known malicious redirector, indicating an attempt to lead the user to a harmful site. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=shrek+and+shadow In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408873/normal_6014b693420a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5ff24049cf7fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_5fdc4302d2054.pdfIn PDF document text
    • http://bavedibigilomit.66ghz.com/92961687972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_5fdae9a71ce1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fed68e9490a0.pdfIn PDF document text
    • http://kutufirix.iblogger.org/column_addition_worksheets_3_digits.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370280/normal_5fe5a76d163ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fe9117b81a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_5fda1cb7e0989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5feaf9609d92c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_60191ffe4177f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_5fd3b2428ca24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd68734bae7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fffbd25ab72a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_6017c902c9a1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fe451a2c2d0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovunebezub.epizy.com/kaala_tamil_movie_english_subtitles.pdfIn PDF document text
    • http://nonosolagosev.epizy.com/bibaxidajodosexafolu.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/13286885905.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/29783091523.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_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 5140 bytes
SHA-256: 8feb2e31c66f4d761e8575b1cd3c10f0115d8d63964cbb637d14240d694ea1c3
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 10532 bytes
SHA-256: 0b17ad5deeccdb45a255b12a7e65b7ca3ade1a10dbf8c604ea8e6b8bc6d8404f

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