Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7883e98e744ea3e…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 14:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b184678632871d1ca66ebddb9e3ebd27 SHA-1: 64f7b3063bdbca5ea32338350c558762950b580b SHA-256: c7883e98e744ea3e5cfe42c29a4f3210a578526427400055e559cf039c7038f8
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many of which point to disposable hosting, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=5+letter+words+starts+with+b PDF link annotation
    • https://dakhoathienhoa.net/images/files/44879910155.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11855668834.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/34997220439.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/14468204326.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/44622112510.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fetojulozo.pdfIn PDF document text
    • http://ebus.cn/up_file/file/jitiviwiluwakumemezo.pdfIn PDF document text
    • http://vuason.vn/upload/files/76552568609.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/mebavufoxoxonuxepabiv.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce7cd647ce---52949650399.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/29534714808.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/fipoludowarijuxiza.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/jemuwosumiwunemilu.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/sirutedewotomodavu.pdfIn PDF document text
    • https://thietbigas.net/media/files/57759909501.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/99673513470.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/lofudugazaxuginor.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/45306697909.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/86239599266.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/ligoluduxubifosole.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/fakimujemuvodadipipupolib.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_off0000ac2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2A 14800 bytes
SHA-256: b7e52d6ef74a9ce65cf52c2fb85fb69123eb84dd99359e39342048d49b0fbe32
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 10504 bytes
SHA-256: 24e844665f6aaddc3be589df0e977e2c2fce5134b7cc25886b7d6c3ecf3c8a6d

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