Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3301ae382166bfc…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 14:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c0cffa7b4c63d8b098e49f12775b2a7 SHA-1: 68a6b052e566e3fd1af8cf8f0e09decd226ed30b SHA-256: c3301ae382166bfcf66b520fae425213e5299742e298b5aeed9098dd938d30ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs and acts as a link farm, with one notable URI being https://allytemp.ru/uplcv?utm_term=dragon+mania+legends+apk+unlimited+gems. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for malicious PDFs to execute actions or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=dragon+mania+legends+apk+unlimited+gems PDF link annotation
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/7179363164.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7e31e4e3---97433477726.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1cb10b11---fonarikixovaxununa.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/20635745681.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/12892658350.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/musutuwosizim.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/4466962047.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/niworolib.pdfIn PDF document text
    • https://ccskin.com/geektic/files/wuwabediji.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tiverufosopovugerapivem.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1391353343613e0543ad6d2.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/wolevafaxodakakumo.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/fujunonozurizewubax.pdfIn PDF document text
    • http://podushka.by/files/files/82458849613.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/3448233392.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210925084647.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/68448291739.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/18984567800.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/23357525951.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/toxitanap.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/19874557202.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/semukitijibabululu.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/kegemejuvitela.pdfIn PDF document text
    • http://ruresept.ru/files/file/jupabosorijexez.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_off0000b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 10928 bytes
SHA-256: 8d7f95cb02d194c2cacf229f7113722a42c8da25250389cae38974a331fe0f8c
font_01_sfnt_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 15032 bytes
SHA-256: e3540cbd37beb3e301016f6881ec0222e32ed874f3d78467986cd53d052cb974