Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc7f459400a5cf4…

MALICIOUS

PDF

76.8 KB Created: 2020-12-04 02:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3a8a937d7a78804c15135f7b968277c5 SHA-1: 902a93a0ff494f99603087da2fee08db7bbe32ec SHA-256: 8cc7f459400a5cf42fdcad472fad9de20c0dd6214a9692f50f825216932a77e5
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://cctraff.ru/strik?utm_term=rainbow+loom+bracelets+made+with+fingers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fadbc915d660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_5f9ad4322f80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8b013cc170d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5fb7d19d42175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_5fb9f52a85ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_5f9b7bede76b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fb89cdc68401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d900d26ff1194f736c6f/t/5fc13cdaa97599144e249c2a/1606499546658/57502690936.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e067a13a450bab010c7c/t/5fc64d5a3f75b16643aab2dc/1606831451143/47990093221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6553dc45-e102-47e7-a837-f98808111dd8/fuzuxebuzoludugeg.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d49a16f6d44b07be6b5d/t/5fc5d3b03570fb44d1ccc1f7/1606800309188/nguyen_ngoc_ngan_bao_nhieu_tuoi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc198bcc6d9645836271125/t/5fc2eafa4e98326c02715758/1606609659651/jitemovudavugogow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e627116eb00e3c4beed8/t/5fc3b5a43c02f22b9d7e4875/1606661542168/toefl_ibt_score_conversion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe728ff8cdb769c6b5ab50/1606316688811/36356889020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf672a2dd96f5918e7230b/1606379308153/devudogegaxeguxupigiko.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5676 bytes
SHA-256: 18601e15cb6b078e42bff99a43d3b205b2ff4daa035ef12b770354437a853df9
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10920 bytes
SHA-256: dcc0adca9c4556a6994c93141a9a0d9fd40b7695163b6d8c579a5eb5acede833

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