Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d71ade8f4ae1dda…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 13:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90b2885e6e410283b1eb729aab8dd929 SHA-1: 90b7f73a4251bcd2622873ca4c5fffdb02c2471f SHA-256: 4d71ade8f4ae1dda7e0d7459236eb157eaedec4e27e48ecff68570d2c15a4d45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs and the PDF's structure suggest an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cooperspick.com/files/jesiwatebono.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c672cf7b---11694218295.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/geliwapawuvax.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/lusiwi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/lojukinikepekuwan.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/54938813701.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/91683142707.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/12994019507.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/pokalanetunez.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/43876348788.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/35352423576.pdfIn PDF document text
    • http://goldia.cz/data/file/54948335001.pdfIn PDF document text
    • https://suruburi.net/mm/file/72512693796.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/budenedefesudabozorenu.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/97293530784.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p3rcv28532jl6r79t852r0rj60/gezemurumefenerukowiropo.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/55420968914.pdfIn PDF document text
    • https://ms01bet.com/contents/files/11209720798.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/jobevodesanimopagenegog.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwumafawasutolako.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/27251403862.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/44507197339.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dumefirujumupakija.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/buzakajafame.pdfIn PDF document text
    • http://riph.pl/userfiles/file/77706835032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mario+tennis+gameboy+romPDF 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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 15092 bytes
SHA-256: 3c3d6b0f52c8a8a06f35523c0c14fb0f4cea67bfb43d21823fdeaaf3fa086dbc
font_02_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10652 bytes
SHA-256: 5ffe6b789ef4622ae9ab5562a2c6e0b0b57a7c2589ce9d2f4beec3de24ce4d71