Malicious PDF — malware analysis report

Static analysis result for SHA-256 6428d6a589b213be…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 04:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 096c387bd71351ce3b1af9aaf62a32f8 SHA-1: 430f0d72f981ffc6c1022f05218a0abeb519c627 SHA-256: 6428d6a589b213beb38912d2a38cf95da16f11f1b730db32dcf70bf024a18dc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The embedded URLs, despite some being marked as benign, contribute to the overall picture of a link farm used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://avanti.pl/userfiles/file/18251628876.pdf In PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/pazit.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l2etloe6eo6670dsnni18prb9d/52497974204.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/rumofutobejuvut.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/supadejo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ff0760ca7e55ad70973142355ac59d37/92340569453.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/82347762439.pdfIn PDF document text
    • http://okun.su/upload/file/savutolamilunuwowegaxiz.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/laroto.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xevasetoxususikakef.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tewukomobudagorujososutab.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/81142605476.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/gevetifo.pdfIn PDF document text
    • https://expomediainc.com/upload/file/75355473665.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/43476476458.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/3884375381.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/17930071121.pdfIn PDF document text
    • https://petribax.com/userfiles/file/jaruga.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912084310.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/2486541965.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/70739538628.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/novarasago.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/69422763332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=create+apk+react+native+expoPDF 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_off0000ae17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE17 10444 bytes
SHA-256: 111236828b8252b979b3d814989e8c5ab1491362c6cbbcaeb0978c15a32ffad6
font_01_sfnt_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 15204 bytes
SHA-256: 423eb5943c853cb3fafc316bcd966e8113ac03d7516ea41b6a8a69b9cf4d8ca0