Malicious PDF — malware analysis report

Static analysis result for SHA-256 354cd42bcaf7ea21…

MALICIOUS

PDF

69.8 KB Created: 2020-12-08 14:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e73c6c28fc7872578b12aae2ead79dc1 SHA-1: 7954c8c803a5ce8159528d4da5528cb58725593d SHA-256: 354cd42bcaf7ea2113a12d55ed215cc0585e1154ea9107f360eefea68b8d79f4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious. The embedded URL points to 'traffine.ru', which is identified as a malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://traffine.ru/strik?utm_term=nec+2020+handbook+toolkit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9f55a359da6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_5fad254267eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5f99bd4e85b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_5fa3b711807ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_5faf4b79a2afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f8bf76cc3a8e.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/6757e826-8283-4d37-80b8-d4f75be5f43a/35395360283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab74142d-b321-4bac-9cf5-9ba1afae0b6e/72008181002.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/26835447327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613f91a1-b623-4712-95df-9c4b0081b5d0/counter_strike_1._5_bot_paketi.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/math_science_fair_projects_for_10th_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7856643c5ee75bf2cb04e/t/5fcec50f0ff3944fc5465193/1607386384451/nowemixejinojowag.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_off0000d46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 5200 bytes
SHA-256: d3e890d06394ed46cddbc7b5a769a4d3317372362afff4b7a71d6c05656e6fd7
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 10840 bytes
SHA-256: 9d1d53871cd49b4fed7a387a69f9e4a83f530e3e819218cf4491c0c1b44227f3

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