Malicious PDF — malware analysis report

Static analysis result for SHA-256 41292cb26b961d66…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 11:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 01739300c305ac2acd25411c18f904e2 SHA-1: 0fc0452bcbccd89c08aefaee6e3266fda66fc1c4 SHA-256: 41292cb26b961d66a51fa4e4cf468213b457459effb19459cad3a54036310138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript to facilitate malicious actions like redirecting to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/sexekego.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/28248072713.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/satixijon.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/73300117460.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/dotesejoman.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tijopox.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/pijobumijeruneta.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/86326583168.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/16001390055.pdfIn PDF document text
    • https://mimpidia.com/contents/files/69618798269.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/xovutofojitujilude.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/dilopotela.pdfIn PDF document text
    • https://tessuno.com/upload/files/612ed6c00407e.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/29710960178.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/79911416390.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/71285913647.pdfIn PDF document text
    • https://preciseenergygroup.com/media/nadiwufiwej.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/14502515422.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kexodajititoboxuneli.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/fexifakurakoza.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/sinitulopavov.pdfIn PDF document text
    • https://aashianarealty.com/file/wawiramevazixaxiwur.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccc684089---roxanobigul.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wasizipisaxasolado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+transfer+my+contacts+to+my+new+phonePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/piwirivaza.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10796 bytes
SHA-256: e2feac039af3ddb5661eedda5a1ed791da9e098c38e0003e98368b3ecdade4b6
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 18148 bytes
SHA-256: 21ec2d08a542dacffaa4e6d6c7613b05802ed015fa9df0faf2479a265a6bea24