Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf3a869d4277005…

MALICIOUS

PDF

72.5 KB Created: 2020-12-25 20:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 317be6baebc6cbefc31a6149946fc529 SHA-1: 50a20a7edb59b37dfd9eb4c35a3dcba439d0a6f7 SHA-256: ddf3a869d4277005bfb84108098e6f7e662d47f7ef5e076334751982aa80fdec
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 link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL point towards a common phishing lure.

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/strik?utm_term=among+us+character+colors+yellow In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5faf87939903e.pdfIn PDF document text
    • https://cdn.sqhk.co/tabawapizak/ccgixgi/dictionary_italian_spanish_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fd3851b9256a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5fc4e8354cd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5f9b91fa58d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5fbe3a46a1c0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_5fde83b56ff59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fe05964bfc2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55a2128-978c-4e21-b99f-8f11483b9475/19172074028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ec52fc-d8ee-462f-baef-85dbc0a2faaa/99414603477.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/99644192396.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 3312 bytes
SHA-256: cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c
font_01_sfnt_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 5396 bytes
SHA-256: db97d419da7ffe7c19c641ef3d946fec1e67152060ee862bf5178fd44d54760c
font_02_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 12160 bytes
SHA-256: d5f795901126858f7ad0df32b6765ee4e40d906f16b0fac322c528596ebfb973

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