Malicious PDF — malware analysis report

Static analysis result for SHA-256 272ae6ce4fa41a4a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 21:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f68f807b37a9951b67f0d3a4f6dbb9c SHA-1: a050d9119067f6a70cd42d9677f8447d33612605 SHA-256: 272ae6ce4fa41a4a336fa76418aa06ed728527a36fed89876be599ccf821be4d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=b612+camera+2020+app PDF link annotation
    • http://ykzn8.com/upfiles/editor/files/19697116595.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/memegovasogadu.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/87637705190.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/guxumoxefupajixijapidejan.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/mulijadaram.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/48625629851.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/28240666893.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210904_E85E44C2CCBB5155.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/rejidejemejodora.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/bapudikurojupobu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322f808dd96---14255731439.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/peninokonizejerukoleperir.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/sajuza.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202199342467450.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12499308619.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/39903268628.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091008123910.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/xufaj.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/75013533289.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wawaduduguteser.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_off0000b652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB652 16212 bytes
SHA-256: 2e761489b06a309af041648614bf45962c111f68d4e7cd45e916a3c051ef4ab7
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10420 bytes
SHA-256: 7d887b275d6618e4bcbd46ee0074b59b85ad1b76dea7476cb5c520896bb2a353

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