Malicious PDF — malware analysis report

Static analysis result for SHA-256 b133612c49411231…

MALICIOUS

PDF

75.0 KB Created: 2021-06-07 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e9ffe17dc8ff64f5aa97e83ce859adfd SHA-1: af986ce1146ea99caf1cc4269356762e9df990a7 SHA-256: b133612c494112311c16e5cb3ba362c0d28d01d3bac0d92aab490a50186bd899
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=jingle+bells+music+sheet+piano In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_601f2b1ecb2fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_6039540322db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60bafb7622f89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448110/normal_60060fb842705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fce95c92c759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_600acbcdcb12a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_604d32eebc903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_6051dc994251c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_60411e53a084b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_6011de12eadef.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489251/normal_60b667327985e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5fc9cf43d54a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_601581825afa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5ffbf1ddc4d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_6028012bb0b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_606e03f8635dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_600b6c61e49db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5ff48b4d19b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_5fd8eb8fcc74a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezosubi.pbworks.com/w/file/fetch/144780321/gadoritibig.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424389/bosch_ts3000_specs.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/86503388810.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 5380 bytes
SHA-256: 23b3a5567ec833e6ea370a3e82e7884d4c4b847379566af36656c0efb6d27b06
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10880 bytes
SHA-256: be94207d20caef5c6d87f019a5f01eba31cdcefac672d4188644a5220f0b3605

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