Malicious PDF — malware analysis report

Static analysis result for SHA-256 91056978867496c2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-18 10:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9ae5eeb23e9d81d4f31fba4cc54ef5c SHA-1: 7f4c40ae0b7945cfe7afa08a7b2fd716d979ceb0 SHA-256: 91056978867496c2ccc650c6045cd354ba476c9a5abfe24bc3312ad6dc927763
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. While no scripts were extracted, the overall structure and heuristic firings point to a malicious document designed to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://libertyrealestate.in/ckfinder/userfiles/files/kurelazavose.pdf In PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/badupiselunojuzejikojoxux.pdfIn PDF document text
    • http://katela.net/userData/board/file/21215354517.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/75212953995.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/77301219246.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/26666642357.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/puwubimopizafozorido.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/70054276642.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rijuzokenexaweroxoxulofuj.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/gadodukujexenomagogotodib.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/62909111977.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/26813546223.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/gajidobe.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139bbbdce63e---30032264126.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/94488791130.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/jovoperoxuweliziwa.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/uvpjg5vtedpcnprd2stsj2fj71/xawuvatoguweveporu.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gadimi.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/95753582573.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dejigurerudelegitene.pdfIn PDF document text
    • http://wwsm-us.com/files/file/6692632547.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/17201617502.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/siwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=online+movies+sites+bollywood+freePDF link annotation
    • 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_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 10784 bytes
SHA-256: faca8f9521ef0de1b1093e5a1840d2c026809e2a879ccefc4b5352c75776c178
font_02_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 15760 bytes
SHA-256: 49cc04e5c676792b39107549f8c8a4ab54d4023dfd64b40b43dec28c52b5625c

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