Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ed461341d1be34…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 01:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e28e6ce7bf6200466eb211c75edd075c SHA-1: 17376f7cf44db7390896cda13e9255b29eaa5666 SHA-256: 88ed461341d1be34fd5454fd864cb98b46ae86f61c10088b5b266d9793b37d31
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for SEO abuse or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sarljarry.fr/userfiles/file/38738639066.pdf In PDF document text
    • http://x-mobio.com/upload/files/8990252470.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/99906365526.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/15027365692.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/75050283623.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/ledomoletefadumum.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/24892893368.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/58908168431.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/laruvo.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/55285557213.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/47117200150.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/tigewufozoxujuzetesaduxun.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613663b691085---1895116470.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vabewovuvagef.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dujazutazidadowu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zirolezabazogivaxo.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zegivojonigepib.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/47476765834.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/88158515668.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/mozopiguziji.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/53225005376.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/70802962817.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/14850838959.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/56073525178.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8545dc49a291d6398c56c83c43a2a553/94383119075.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/93877385786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dvd+player+app+for+android+tabletPDF 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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 10644 bytes
SHA-256: 3d927d8bcaa87e00d330986cf5f7834a70cf4cde1afd182eb73afca8471b8dd0
font_02_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 16800 bytes
SHA-256: 71efae9369e18fb3586fb0465cb5d034e0b0dba11ff4027d6555dba8cd96d01b