Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c527a29791c73c…

MALICIOUS

PDF

69.5 KB Created: 2021-02-20 01:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c75a69b27cbcb7e1bb3251124c9e554e SHA-1: 4895b5d0ba2dbc8f9a3c6eda01b11b54640ca1f0 SHA-256: 03c527a29791c73c7ff891e08aed9662ebf10e5630d862bbf512668cca7cbe01
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classification. The embedded URL 'https://yafferge.ru/wix?keyword=turner+primary+school+staff' is a primary indicator of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/wix?keyword=turner+primary+school+staff In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_60298ebb1f32d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379969/normal_5fc663a2848f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fc953a27dadf.pdfIn PDF document text
    • http://retys.fun/coreldraw_to_converter_online_freehl5vm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_6015d37a7ad88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600e64712acb3.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/dgdjhih/wufokuturixaxizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5fed3b2122b53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5ff8027360e86.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/loranoduzuja/building_construction_specification_philippines.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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 5308 bytes
SHA-256: b85664fa759fec35c44facd03e11a3078518c5f6a45bc02795006e469f4858e1
font_01_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 9928 bytes
SHA-256: 2132c832e630f0b81f698913688b57465ff8ef24b2412d41153f243e9e1146a2

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