Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1f405fd3aa4245…

MALICIOUS

PDF

98.5 KB Created: 2021-09-17 08:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c18a8a584a3f039d28744c9a14f62502 SHA-1: f4f7676f9adabf5a85e15be1fb06806ccac2d237 SHA-256: 5a1f405fd3aa4245b9c991471524bacef0ac31805d86ae46b79cae841414d12c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomaquito-travel.com/editor-images/lozaxof.pdf In PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/legisowasapikiniburubaje.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/59942981481.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb3bf2676---lekinuboximudibibazobodid.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/5225014094.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///kikovadumu.pdfIn PDF document text
    • https://khanikango.in/file/71271416115.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/robuxikepitakopigodibidol.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/xofisozomosijug.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/xexeniwomubigutiputin.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/44212808357.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/59242309949.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/purefiwinatagenuzelewemi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/wuxaketi.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/mapilaxirebidudi.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/bolesemidor.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/lulurugakamidide.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/tokizovikawilazir.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/vezegekukixusamoko.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/59567813861.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/rogijamovujo.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/44788431710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=happy+go+lucky+filmPDF 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_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 10516 bytes
SHA-256: c0b9769245930c123628cedd1abfc4f9c923889ad9f745d0b246b889b51f523a
font_01_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 18404 bytes
SHA-256: da898330098782888954affdffd03360323bb227158b2a24ef7af6b4bea07a9a
font_02_sfnt_off000164b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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