Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfab562562924db…

MALICIOUS

PDF

73.2 KB Created: 2021-01-11 00:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cab2265fbf3d38eab4c9cbd740df3fe6 SHA-1: ef3bfe6fa3b8d0d57c752d5700637a327e7f4b79 SHA-256: 6bfab562562924dbe0968e24da35d135f199b62870972eb1b48a0a6fe1f81dc1
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=according+to+the+lectures'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of a malicious URL suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=according+to+the+lectures In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5fad5a65c9686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fb4cb5487c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5ff0e94527b08.pdfIn PDF document text
    • https://site-1178570.mozfiles.com/files/1178570/cake_decorating_ideas_for_birthday_girl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_5f9aed88342fd.pdfIn PDF document text
    • https://site-1195445.mozfiles.com/files/1195445/64993012747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5f99de57a897c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fe5ae471091b.pdfIn PDF document text
    • https://site-1168215.mozfiles.com/files/1168215/blueprints_rust_unofficial_base_builder_designer_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5fba3e4ad1aba.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/bifadiwuwileji/nikon_coolpix_reset_factory_settings.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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 4980 bytes
SHA-256: d27151f7561d5a02a5a54f74388609fc6b5c1f6e3dd84ac2ac032bf28929afcb
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 11012 bytes
SHA-256: 0374c934cd196cb0db45c34bb11662fa0a23b75a2454af11eaaf5894c371d6ec

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