Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a55eaca4a63eeb…

MALICIOUS

PDF

40.4 KB Created: 2020-11-07 06:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: be47602878cef5de8051003d850d2a00 SHA-1: 5376d42fa9d1cdd04006b87362c733ef3485a17a SHA-256: 63a55eaca4a63eeb21227f24b8c508272a16d827ea016135c779fead1b19f6e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?keyword=retired+inspired+pdf+download PDF link annotation
    • https://seforurusux.weebly.com/uploads/1/3/4/1/134131879/eec12.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/kaxopi_kewijadoxu_jozovil_fokorasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f88b829e6fc5.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/senug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f99962376d8c.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/467740.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/seraralobif_kotovuxe.pdfIn PDF document text
    • https://miperodijazef.weebly.com/uploads/1/3/4/3/134308013/a3315.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/8351f06b-6688-473f-83e7-9ec7a4ffab88/mathematical_analysis_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60044f79-4e55-4053-bcd1-bdc92b37d1fd/rirux.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://bepamikolif.files.wordpress.com/2020/11/tusuwekagosimixo.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_off00006297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 5136 bytes
SHA-256: cf2b028a6ca25750cb33b073c16ddfdea4b10a36629d052a7bc1fed1d7c7a218
font_01_sfnt_off00007435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 9648 bytes
SHA-256: 1b5c984cd1fb3c2bea209b9f949829e7fdf2e4f9a6bfbedc85a2c9144d64fe83

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