Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b7e077261ec1eb…

MALICIOUS

PDF

39.1 KB Created: 2020-11-06 20:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d1cbf45785da24111b564578db84078 SHA-1: dd8e371bbac438925c387696d4d114ca6cdd6ebe SHA-256: 63b7e077261ec1eb351c230cd0475da2b37eb87b4e29802de92d12e4ea55f295
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://traffine.ru/aws?keyword=fluke+linkrunner+at+2000+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f9530e903372.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/5b04ca83cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8755d2b1a0e.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/radaf_ludar_jewejasewomux.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/lodalawibane_kavekemig_rifiw_wupopewoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f9a4f886b2ed.pdfIn PDF document text
    • https://lobizuwoxigamog.weebly.com/uploads/1/3/4/5/134515373/sitasinelunazawosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fa0e4fa604eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fa367fc39284.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/18563292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f8ffbbc31be4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f97858594363.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://punumovuzup.files.wordpress.com/2020/11/16950068939.pdfIn PDF document text
    • https://zogidadovo.files.wordpress.com/2020/11/towutajamewunopixoxibin.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/the_philosophy_of_logical_atomism_bertrand_russell.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/mta_bus_depot_number.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_off00004ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA3 4896 bytes
SHA-256: fccadf56432da3ceeba9fefa221decd5e5dfa487f2ee6c6208e7c95ae8258254
font_01_sfnt_off00005f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 10100 bytes
SHA-256: b323b66844f20436530d8b900d2be4a86ee9bb55fbbdd4d1eb1204a880cbb81a
font_02_sfnt_off00008138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8138 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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