Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04d71b24c83295b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 18:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 832b2bb875877a2dcde36b3f78cf1905 SHA-1: 418263279fcbb611bea7327999abb0c115a5add2 SHA-256: c04d71b24c83295bc42fcda13d2090e946e3fd728aec1e779781e736866c6959
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this being a distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://slmj8.com/data/userfiles/files/22001197337.pdf In PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gizapepabax.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/95710747782.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/76562759509.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/39425038747.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/67278960649.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/17156635370.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jivumilujapemonubunamazet.pdfIn PDF document text
    • http://lizhechem.com/upload/files/fotafujewedunewiwil.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/zisuzolow.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34515345636.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613165828bc20---pagiwesipijajedumiv.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/kizinoni.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/31944070080.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613658e41441a---negeta.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/fonexoxadatit.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/zodidijopovarut.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/welozegizumupaz.pdfIn PDF document text
    • http://technocom.pl/editor/file/wobazozavepo.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/putikubebufabizonimig.pdfIn PDF document text
    • https://lesura.net/userfiles/file/2600069576.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/80708032650.pdfIn PDF document text
    • https://makenie.com/upload/files/kisagekebijobinuj.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021951833238361.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/niruwekemikozukagixudu.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/lusesufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+hacking+app+for+rooted+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_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 17188 bytes
SHA-256: 2e300976936ca69d2c6ffdfa63ca96cee5384df7897ae8e2f1b16e96f3f30f31
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 11000 bytes
SHA-256: 2bde89365b7bcdfd98f7fd0b765b486839935c0f556fa37c9bd2f43526feebdf