Malicious PDF — malware analysis report

Static analysis result for SHA-256 c343a0a365c6f50a…

MALICIOUS

PDF

67.9 KB Created: 2020-12-31 22:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5bf3b4b729f4f09a12a22f53db7d0bb0 SHA-1: d5bb74b729bd12246ef750b9adc3bd5f7f1769ee SHA-256: c343a0a365c6f50aa1d0b80b1d87263d9bbcaab7df9cdfc93aec91e762238040
162 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://ggtraff.ru/123?utm_term=fgo+angra+mainyu+ritual'. This URL is known to be associated with malicious activity. The ML classifier also flagged the PDF with high confidence, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/123?utm_term=fgo+angra+mainyu+ritual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fe8c8c5c8237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5fd6ac49982c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5fbccbb153fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f909a54670cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5fa09260bdb84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5fdd6e44cc621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_5fd2c720df3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5f9426f8c3524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5f9d63549305e.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/5ac48411-3809-4dee-9d13-b918e42b59ab/rewowakesefesav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5890d9-d874-41ab-8982-827dd9ebda91/30152819464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22edf4f5-a412-45fa-bbdb-72cfec1523ed/antonio_piero_libros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304bf45c-4782-4c4e-9673-2473a6563397/72030776451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6be14e-f947-4f45-aa86-a7015637a247/jowovodetojewuf.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_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 4884 bytes
SHA-256: 785e9ba7c76331279ad5e795f230d9566bcbf9743709f95b4b1182b8239413c7
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10976 bytes
SHA-256: ac2cf1f845909b803395a85b00584eb8dd06bb34068479df19c517a19157e04e

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