Malicious PDF — malware analysis report

Static analysis result for SHA-256 136834740af2fea7…

MALICIOUS

PDF

68.2 KB Created: 2020-12-02 21:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 570d5936e7ed45fa472689cad66c50d6 SHA-1: 079d42a3085877bf33e6a39c533e2a8171ed17d8 SHA-256: 136834740af2fea7228c787758cb428d7cb9f8d71d4841e4bea57a4481526153
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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=siege+and+storm+pdf'. This indicates the document is designed to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary 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=siege+and+storm+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5f9b0e8e6501c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f99cc0b990cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5fbf5c55a7ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f8daa3f4983d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_5f94c1864cc3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8d0b69a222e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_5fbc22ac48021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fbb588b6e96a.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/putelekireza/70698179954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0acb0471-a062-44de-a937-04b9e72f1375/1579919750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d06dcf8-25d0-46f8-aa71-7994d30c2884/how_are_work_force_and_distance_rela.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/53799785141.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3aee9d7936484059eaf2/1606302447075/wexiloxetivafotumaluzugi.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_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 5432 bytes
SHA-256: 671b5f4145794888bb9730f3414e63919f5ce1b031f2073b33f21f9cb3733134
font_01_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 11128 bytes
SHA-256: 19df1d3a13d92508a499c7a02e5dee11faeec666988747c197c53d3b8cdbfe73

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