Malicious PDF — malware analysis report

Static analysis result for SHA-256 3feef88165432186…

MALICIOUS

PDF

62.8 KB Created: 2021-01-08 09:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ccf1343f9e710b2c488786467bb105ae SHA-1: 9178d808dafdbe519ff294d7c8e9a52ca73ec86f SHA-256: 3feef8816543218627b7e04cb68f8979996759b54130abb6cf3f586c90a0b68c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/aws?utm_term=uc+browser+mod+vpn+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fceb02bdf996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd686eca5a52.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/hibid82/79302602605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8750c1db999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fc45d837ef8c.pdfIn PDF document text
    • https://cdn.sqhk.co/nagigureti/Xididia/wabemilelomijatakom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5fe02aae2d728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443341/normal_5fed3aecb6f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5faa1892e8d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_5fbc42e653a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fb4b54c084eb.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/pujinit/65952570736.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/kidney_worksheet_for_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0d09dc-6236-4f5f-9c52-65440dd50636/14383845178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e04b705-21d7-4d99-87cf-07723c0c63ce/7677521981.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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 5532 bytes
SHA-256: 830fff8b85ff6c5f1c0b15be131a2c308df68a6dc09ca9a6d44d719e9248bcd0
font_01_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10012 bytes
SHA-256: a874e5ac81e787e55a9ba2325f37aea8bf73e4956806b01ecbe864fb8dbe71f6

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