Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dc047cc57e151d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 20:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f01b56863a78489b7a0e35607b20d9ea SHA-1: 975e8388576f96e6a1e501dec40d9e37f2f2bd94 SHA-256: 97dc047cc57e151d9980871ff098f6c95c7d11b6580e053fdc396a4135ebef1a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, likely to distribute more malicious content or engage in SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=photoshop+multiple+choice+questions+and+answers+pdf PDF link annotation
    • http://al-bandak.com/userfiles/file/vewag.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/33757695711.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/wasugekusenosugemepid.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/sokuwepet.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161425d2e8c194---8821464722.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/66459566428.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/safuvowusanimojokov.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75604085271.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/vuwimujewatarulotem.pdfIn PDF document text
    • https://viceda.com/userfiles/file/tevisigamazugu.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///58609329155.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/67345523354.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/87685715161.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/79877052788.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/48937957199.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/222451185.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140ddc6d0a1e---rodeluvevela.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/mesupexekozosepofut.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/badetazegitubebuju.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/6223215699.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/98083288318.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/1606281653.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_off0000b04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 16352 bytes
SHA-256: 642db23d86f6ab360defe80a4c98e71da914ac738c6adb98044f8a66da01cdbb
font_02_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 11216 bytes
SHA-256: c38a51d1ea9b95f16c02bc70f3b650b58d2284ab0f83eb6993db2ab44d8dfe66

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