Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f439477148de07…

MALICIOUS

PDF

101.9 KB Created: 2020-12-15 12:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9da1f97ab48a86bba363ccd426c9ca9d SHA-1: b8b404583dfd4df1199d62b7016821078f90b11a SHA-256: 98f439477148de07c73ea68614bfe270a7ba205d2fcca80874cf2fc477f29ff5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or a trojan downloader. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the PDF link farm heuristic suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=como+funciona+el+sistema+solar+para+ni%25C3%25B1os PDF link annotation
    • https://wilitixovin.weebly.com/uploads/1/3/4/3/134351513/ganamodexuzodam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_5faaa5515c3e0.pdfIn PDF document text
    • https://fafugugopogewip.weebly.com/uploads/1/3/4/4/134464831/7ac7f2b8e1e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f97a13986e33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fc1a94db3b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fd3362f67d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_5faf1828713c4.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/13610090-0326-4292-a9ce-fa760df27d0d/94401091268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8754c83e-8b4a-44fc-9a0d-239e13aecaa3/pegupodemofutidudibuzazek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f76cb3e0f5771470c64/1606377335545/62489039778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd725b6c-5a75-4b07-905f-824df2ae01d9/xiwojizifonodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10634a3-e11e-43dd-aeb0-993f9d083103/80723418602.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28838abaecd33182c940e/t/5fc5bffc08845d0924521302/1606795263141/nikon_m_308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec759ac-2169-48b5-8c29-2087f79679e3/urban_warfare.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_off00014caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAF 5280 bytes
SHA-256: 08e1df842a299114a16e674a1ad49f9c9af16f2be7b88330b3efa84c8a9be4e2
font_01_sfnt_off00015e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4A 12756 bytes
SHA-256: baa25dc590f8a9077b5e7f7d556b56ba1c6c4c7b9c3b28dad5d05b62e4885bdf

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