Malicious PDF — malware analysis report

Static analysis result for SHA-256 9515e692accc81b0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 03:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae86d6150d23eb97caf2f1031c5e67ec SHA-1: adc89f3cb6b0b80099223f94edf09bff3e4758d6 SHA-256: 9515e692accc81b070769c5244f983487221742e3f9960349b6b06d75e6c3d66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, 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 SEO manipulation or to distribute further payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365d69057a4---62769051992.pdf In PDF document text
    • https://affordans.com/ckfinder/userfiles/files/70706871676.pdfIn PDF document text
    • http://dsagco.com/Upload/file/33078896208.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/1982868749.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/16398022120.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/85061509809.pdfIn PDF document text
    • http://mgrima.com/files/file/9524793980.pdfIn PDF document text
    • https://norservis.com/files/files/27134118075.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/lijuvedifewifi.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/46597783674.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a0ac6cc1aab00bc1c3cae66b2a68ce15/29603730903.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/21635689041.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/dimototugumezofi.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/liwuzagevidene.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fekopowitebetogosivozim.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bosagido.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/bipamokudiku.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/9525171228.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/70046332522.pdfIn PDF document text
    • http://bienbao.net/uploads/files/panuba.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/23711819456.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/36550583115.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/favusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cinta+sekali+lagi+episod+21+full+moviePDF 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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 17812 bytes
SHA-256: 0b35ceadde05fd9d88e84434f233a2414d01f9fc2937e35b9d63f14c12f4f222
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 11200 bytes
SHA-256: 0c2b927b09dde002044ceb583a3b5be9f8f201e839953c803fb704ab0bf45d72