Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a9d58140de8d16…

MALICIOUS

PDF

45.5 KB Created: 2020-11-08 08:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d7b63398c7ddad4e940ddc4805b426cd SHA-1: 829a5f2e96502e4bae8e69b508ba4954f974e417 SHA-256: 47a9d58140de8d16566aece61747ce5ad021948264d7997d7fd261ec2e778229
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an embedded URL that points to a suspicious domain, likely intended to redirect the user to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to obscure the final destination. No scripts were extracted, but the presence of an external URI and the ML flagging are sufficient indicators of malicious intent.

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://trafftec.ru/123?keyword=6th+grade+science+curriculum+guide PDF link annotation
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/d036d17d.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f8ceb27c2fbf.pdfIn PDF document text
    • https://jasasenud.weebly.com/uploads/1/3/4/1/134131975/69e0a0b6c891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f9412f41d39e.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/fe7fd7ddc34.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/wavavomewa.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/de561b3e-007a-432f-aa37-b36843065012/42891053791.pdfIn PDF document text
    • https://bebivix.files.wordpress.com/2020/11/silezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9c7558-9c9c-41b8-a15b-80495b3744ae/58502730794.pdfIn PDF document text
    • https://mefufigas.files.wordpress.com/2020/11/sovoxafusarejuderokuvoneg.pdfIn PDF document text
    • https://gozodusi.files.wordpress.com/2020/11/71527164481.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.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_off00007477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7477 5412 bytes
SHA-256: b62e3c127b98bd7c21a9762b0dac888121d63812d53dabef8fba89826f040f46
font_01_sfnt_off000086b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B4 10056 bytes
SHA-256: 667d3a0b56f99ced21d96dc00d4e79b1760198f4f0a84336a2825ea4bb3916d9

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