Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e45ba2b3a74cfa…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 19:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa108fd43572088c8bd186d1c56a5697 SHA-1: 92d9baba3307949ef8465b90f63a4b9d0e0dfadd SHA-256: 68e45ba2b3a74cfab6a8dd363606d32ba31779d3e036fac81c672929a070140f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the high number of external links and the heuristic firings point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=man+of+the+house+2005+full+movie PDF link annotation
    • http://hutnia.pl/userfiles/file/46659912745.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/rukasidawotirukimodox.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fapekitesawavevomin.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/jepem.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/10165279633.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362ea54ddb9---48989091707.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bawafemajepajelidovuw.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tamaresabapomobuget.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/37535548795.pdfIn PDF document text
    • http://julianina.dk/upload/file/28604522281.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/81368380859.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/23833809525.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/26246395702.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wunuguxaturavubifefiw.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/vopuwazigebadepalisabip.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/tccepj7ttt6plnfq1dhjc5utu3/72507652888.pdfIn PDF document text
    • https://jss-moms.si/upload/File/dizotebipikuz.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/devivajepokizarixa.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nivikotexepexuzef.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/73023632240.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/674522924.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 19076 bytes
SHA-256: 4c306cb437541f8aad5d727a02b2d788788e43aff64473b3450a40a9d899a739
font_01_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 10912 bytes
SHA-256: 17cb359266c266c1df752990a6a10278c186f86d3e4083229af78226587de77b

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