Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a792f2b47621ee6…

MALICIOUS

PDF

72.6 KB Created: 2021-10-01 14:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a300339c021f2126ee5312e86ce7fac1 SHA-1: db803408a50d1df74cd15ad7e398070f24a01a59 SHA-256: 2a792f2b47621ee6a0df87f3919f5055efd978952c29194f4ba4d090a0824eea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains and configured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://klwas.org/userfiles/images/file/posez.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vblofsm0hsi5d4cb1jk9lp8p6l/jepivizixorilosadevubo.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/jugilemozoxe.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/dofanimasuxuvevinewa.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/wiberinesutirifawopaxevi.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/zifabuvuwurad.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/zosasawogix.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/54208632431.pdfIn PDF document text
    • http://eva.am/files/bd494ea59979bc26.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/96108877257.pdfIn PDF document text
    • http://fruitvita.com/files/files/71978156896.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6ab2d34dd3714feb9ce79b792079481/janekenedikitexol.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/sakedesipawojibu.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/20719755201.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/6567699870.pdfIn PDF document text
    • http://metall-press.ru/files/21166129803.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/nopoxomomanebiwinewelen.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/poresezokixunupiz.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/46184233824.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/vufotafudodu.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/fubejobatitupanidazodafu.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/26806617778.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/vozuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=como+funciona+un+emulador+para+androidPDF 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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 10648 bytes
SHA-256: e97cdc6dae4b9e2b9698ca12d0288d8428b2e1a33cb38a3a081e69ba796cc5ce
font_01_sfnt_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 18308 bytes
SHA-256: bb76bdb193cb9bf47ada0b9be7716c7674e6fbcdf870254963f47ddb37a0c541
font_02_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1