Malicious PDF — malware analysis report

Static analysis result for SHA-256 320a6afc8fc68824…

MALICIOUS

PDF

114.1 KB Created: 2021-09-08 21:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: be7c62a9e58781a7c99fcb43961c557c SHA-1: 7a873aa3d925fc720de5a4b9097afc0be5dc429c SHA-256: 320a6afc8fc68824f594c99d32ff8b57fa40a49126a503ee58e9aa9c3af2d425
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9975

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://chcial.ru/uplcv?utm_term=dorian+gray+chapter+summary+pdf PDF link annotation
    • http://jiuxingchaoshi.com/uploads/file/090105339288.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/67514973456.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/xaxakipolozanax.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/xukipofukumepozagutuvano.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135be091b86f---jepulepumapu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kagexozasasa.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/34399753720.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zokunaxedusojuzi.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/mesalotitatosaxixit.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210909_387B66B1DA2B8029.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/75e623b563b163c454c674bbd24b36cc/novemi.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_154820.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vabamapogirisukibo.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xumeraminakisagejo.pdfIn PDF document text
    • http://masonhn.com/d/files/72490640747.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/64356234050.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/58939409943.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/marakikigavefemumuvar.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/dotulotubisijixawe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/karikevamaduzula.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/21506301007.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/48963307641.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8B 18948 bytes
SHA-256: 4e52f48dea3e7c9e66b0e61a4105a9a47f3b1657a2f61e15f19899792ef7bbfe
font_02_sfnt_off0001a0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0BF 11236 bytes
SHA-256: b7eee1e9e6c550358b4bfa556b9a5e895677eae155446b7309c298fc169c358e

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