Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa4bb721c610848…

MALICIOUS

PDF

77.3 KB Created: 2021-05-14 04:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 91d16aaee476aad688c0b5a5ec063409 SHA-1: 0fc76464ff33035a6418dfd26ab7cd2550e1f6fd SHA-256: 6aa4bb721c61084866c78cc0b1aeb6068d16291049af9ff97bf2c953b5b5c6b9
126 Risk Score

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 0.9991

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://mezovuduw.ru/strik?utm_term=free+horror+survival+games+on+steam PDF link annotation
    • http://shmelev.pro/corazon_espinado_sheet_musicd9rev.pdfIn PDF document text
    • http://leadtop.co/26829202001j5zug.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/nozunavad_tesubekazu_wuxejap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_601b97c9dba09.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/8b1b6.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/zazepezalisobik_jilibitagideli_bukewoputefoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_600137c09c76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_603d3df83c1f8.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/zugevetixowij-wixonatus.pdfIn PDF document text
    • https://tolorojefa.weebly.com/uploads/1/3/2/6/132681575/5e5435.pdfIn PDF document text
    • http://steblin.pro/nejijoji8xo0.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/1232711864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5ff79bcced8aa.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/mubulanawidar-nawejivu-dupibomepokal.pdfIn PDF document text
    • https://lanilemu.weebly.com/uploads/1/3/1/3/131381326/2274004.pdfIn PDF document text
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/xufekevojotala-matidozi-lipiromofasago.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/a_fair_days_work_meaning.pdfIn PDF document text
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/e6eba95d3.pdfIn PDF document text
    • https://rovijekamiveva.weebly.com/uploads/1/3/1/4/131437241/tukemoxow-kurosafireko.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/47264077781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivarutumo.myartsonline.com/gujarati_to_english_barakhadi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fad6a32-3235-425b-a2eb-b941a8690714/39836308443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ad5bf5-57b7-45e0-8dbd-ef2e3d339f0c/69603696289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e118a6b-c8b2-4973-ace3-483ce7807d14/excel_formulas_list_with_examples_in_hindi.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_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 5116 bytes
SHA-256: 2647e7df41c87dc3479b47f4df6b87d8ce509dbd10375e7f3bbc9f5cef2be926
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 11000 bytes
SHA-256: 08cf96b0cbe0bd41759070898696ba756c73731927f928482c4512098ea58c0a