Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbebe3528377bd67…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 21:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd5163d4932eb7065d563ea3b099f760 SHA-1: 937351963b66257d49ea4a860554b9b755792a58 SHA-256: cbebe3528377bd6716a2d232b87be73e08754eb4626ffbbc8bbf671255d38ee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=a+quiet+place+2018+movie+download PDF link annotation
    • http://denprokhorov.ru/images/file/xegegolupuxalibenidof.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/32878869510.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/65707982235.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/44634039121.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/faranixomuwefazojotel.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/7671195849.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/dirojif.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/garasunusifagum.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/11877429728.pdfIn PDF document text
    • http://rsst77.ru/upload/files/gopikun.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109041320315642.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddb9b6ae---47695351120.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bakilomeditokuraxotig.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/37989715811.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210905183300.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/58135793994.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/22871470920.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109071255574654.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d6f2587f---kilutufojibogefulabedonok.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/97702320461.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • https://akvaguru.hu/user/file/jovejuwuvag.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/kupudaporixudod.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/lodoveravujulaganuf.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_off0000babd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABD 16272 bytes
SHA-256: 2506168a3b20eb2f0f5e3a33ad05373b50b1fac9444e350297e92647c637d58e
font_01_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 11288 bytes
SHA-256: b7e510b1cc5f6b6d6c7a83550d96d2eaf19da9f4f6f2f99ff1586f0ce846f6da