Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42b05a25981c32e…

MALICIOUS

PDF

37.5 KB Created: 2020-11-05 16:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7284ae27eefe633569b27e935a70e6e6 SHA-1: 8809bf9cd02a89db56d68e44c58682f5187623ae SHA-256: d42b05a25981c32e9e758663e524f8cd62442cfd35ef2c2ef95a3f74368052db
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known redirectors, indicating a link farm designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to lure users to external sites. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/strik?keyword=tobias+funke+blue+man In PDF document text
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/rijeb.pdfIn PDF document text
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/44a4f400a8716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f8afa3a57072.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/bc00e3fac5bb8d8.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/nudusoka_kosilekujitejum.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/3539753.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/2cadb022-9963-4a0f-812b-ed3fcb5e6503/gofelutedu.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/capital_high_school_olympia_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce894edd-dc1a-484d-9650-d69952ca4c30/kuwilowovejem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5366baff-84e8-4705-ac79-73924436e72f/pathophysiology_textbook_free_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b347bf-c9ac-49ec-8fcd-d5b85f88ebf8/51218134114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4a26b1-2fad-4ad4-b3b6-5725fcc8bf10/68908021759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dcef2fe-e8f9-49af-9425-ff0060643857/65657136617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2dfa49-726b-4687-ad8a-9a039a841e8e/wagub.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/test_de_raven_para_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6c3cf7-b8e7-47e8-933d-f79204b7bc9e/36643446745.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_off00005445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5445 4968 bytes
SHA-256: 97b5359877d9fdf3e3449d35e6a91f0ac9e762f7c1af43368d429826adf5b005
font_01_sfnt_off00006526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6526 10888 bytes
SHA-256: 7d3c19458638d81baa17bc4854dd13107d311f7c53fe187c5af1cdd1272c2590

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