Malicious PDF — malware analysis report

Static analysis result for SHA-256 afff6931cdc1a62a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 10:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 555709090e233eba249ca97b8505d5fc SHA-1: 74f21e16092c3a1627936497b82e899758f7f29b SHA-256: afff6931cdc1a62a035414be17383749cca76acbb6746ca83fdc81fec4dc332c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest it's designed to lead users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=dark+souls+2+scholar+of+the+first+sin+guide+pdf PDF link annotation
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lunoxajedazejel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa77902e1---gigonorugipivizo.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/94905194540.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/15665313221.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/setavade.pdfIn PDF document text
    • http://cy2hand.com/userfiles/ziborazux.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/35408788690.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/regoxetasisojatema.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cdcde904---sigigunexefazu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/panefan.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/79589610165.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/kavafizemebibinajimuwus.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/73881696934.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/jigutotezomovekititaguxet.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/87070384192.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/sozefuzu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mulofive.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ed4b77579---37317361836.pdfIn PDF document text
    • https://gilbertems.com/videos/file/lewuredepizesezuxivukor.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/9524180097.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_off0000b0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 11212 bytes
SHA-256: 6af814a32a4420fa53e4ba2d41151b96aa721028bec70d2698102a08eb6b12f8
font_01_sfnt_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 15788 bytes
SHA-256: 956911698f07df74b8e7841598c8fd4fc277e6c964ae3db74050653054e13952

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