Malicious PDF — malware analysis report

Static analysis result for SHA-256 61045efedbd3949a…

MALICIOUS

PDF

43.1 KB Created: 2020-11-07 05:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 34a8322970e8afd717a554fbb49e4d16 SHA-1: d4fbee684eca6d4eee48ff8b953ed4672c8860c8 SHA-256: 61045efedbd3949a95e9f5f6cb263f5df618162fc31df6160a9f1b7cb0d73fbb
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 4

  • 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://traffnew.ru/aws?keyword=nikon+m-308+16x42 PDF link annotation
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/wasepodip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_5f9f25bdbd017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5fa41518bc5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f92304923df7.pdfIn PDF document text
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/lusatasasaboket_repiro_fegutobuv_tifemawilip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5fa5c8be03314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f870b87efcbc.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/3243142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e74963ac-1587-4747-b688-460dc710f00f/zutofofi.pdfIn PDF document text
    • https://lirurib.files.wordpress.com/2020/11/21001630428.pdfIn PDF document text
    • https://tojupeti.files.wordpress.com/2020/11/19190516886.pdfIn PDF document text
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdfIn PDF document text
    • https://memixetuti.files.wordpress.com/2020/11/terofujoduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01ff192-50d3-441c-aae2-d74103e6e925/4200532868.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 4964 bytes
SHA-256: 1859a3f63e96d7526f0ec397c7955f190815b09ab16246b94751bf3d5a1e11a8
font_01_sfnt_off00006ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 10212 bytes
SHA-256: 6edb05c41a11f9f5fc88eed06e629e44fc578e0259de06fa46da735efaf0f0b9
font_02_sfnt_off000091d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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