Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3cab1b4a567016…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 03:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c21bd41b5a5af2e0f90e20212f04df2 SHA-1: a58b4c2f1e479c8d5eb659ff5647863bd0f6c0de SHA-256: 2f3cab1b4a56701623e825221cf92345e650c28bf242e55dfdd77afcb8856658
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://queure.ru/uplcv?utm_term=minecraft+emotes+download+android PDF link annotation
    • https://shih-tzu.ro/files/file/38240707813.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/79633954271.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/4241863047.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/82739233318.pdfIn PDF document text
    • https://mkontroll.hu/File/polupufadez.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/49ea11f94d9f77fa6c11f5021d2dbfa4/53560268368.pdfIn PDF document text
    • https://shinaltd.ru/images/file/ropaz.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/81359150674.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/94608545608.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/sakadejug.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/96075051836.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/55454166018.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/tidomejozuzokukok.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210912_234815.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614dab8f68da2---leguzebuzebojowokefo.pdfIn PDF document text
    • http://congtyvima.com/images/Download/gurujoteninuzex.pdfIn PDF document text
    • http://modero.vn/upload/files/xijaw.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210928_11B1C3F930A64604.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/35519683659.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/41253930652.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/96632427859.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nafobijozeramijerakowad.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jodifudajidofojog.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/77463869683.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_off0000af05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF05 16532 bytes
SHA-256: 412b0beb9c08472417b64fdb3d1cd056a9eebc6ac4fcbcf3fa52ec7b467ebc8e
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10716 bytes
SHA-256: 61b9998ab807127ad66916a059f81fc3f9f6c0df33aa0d0f8149fc8d50d6ad3e
font_02_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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