Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ce77f54fda1499…

MALICIOUS

PDF

79.3 KB Created: 2020-11-22 14:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 54c4de7626e1292111305b26a76d2568 SHA-1: 7a6bf2b2a10b655d24a8ef4e4fb77699c4346133 SHA-256: 36ce77f54fda1499cd462ded0ab45232b32dbf35423a4d2ba6471cefd913b12f
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=shipwrecked+in+tucma+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f9bedb82bc77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5fa1678b23d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5f92773a2b2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fa96591a76ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_5fb97063261d6.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/panezibu-niboka-bugalikadil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5faa05d96784e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_5f9fa672bfafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f95950fee695.pdfIn PDF document text
    • https://jepirozo.weebly.com/uploads/1/3/4/4/134474462/pamineriwowo.pdfIn PDF document text
    • https://lukavorewigi.weebly.com/uploads/1/3/4/8/134862497/zujexaga_tafozikej_pawaze.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/jibigamefomoni.pdfIn PDF document text
    • https://tibesegekor.weebly.com/uploads/1/3/4/4/134495245/1195916.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/rulanulo_podukutebovisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_5f97653a8a005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5536 bytes
SHA-256: 95c15cf2081871ddc6c434a6538d9ed3e039f7881f491c46f0fc7b2490ad2871
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 11172 bytes
SHA-256: e01cb37fca6fe39784e921a0af3ddfb3696933b11ef78bde098a1d3551fd456f

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