Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8817d54eb6368a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 00:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4e9ea8c60f3289861f78ee509be63f6 SHA-1: b117dac876e301ed5aabc3b7d9b7a005b2cdd8ef SHA-256: dd8817d54eb6368a4c64244eaa9d1e4a3273cc042674e17527db08277a45c79c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to trick users into downloading software or visiting malicious sites. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://demircanticaret.com/userfiles/file/zuvutafutorotelidebu.pdf In PDF document text
    • https://grandhotelushba.com/userfiles/file/gimuviguxajibagitudoju.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/falabodifub.pdfIn PDF document text
    • https://dafelia.com/files/2833146693.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/memoluzima.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/jolikizijo.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/terejusuwof.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/suserojufu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/namelexodipafewoxim.pdfIn PDF document text
    • https://cardolf.ro/files/45611823228.pdfIn PDF document text
    • https://led7.ru/file/remozopesipogenetodeb.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/12121708420.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/99390977887.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/wajudat.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff458b2daa---79833746407.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3df9e176---sumililinabufu.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/xanobiduganavutivukop.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/fimavazigedewogeku.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/49702432477.pdfIn PDF document text
    • https://bursac.net/userfiles/file/97111580815.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68ff06e95---petadofegegizabegipi.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zatovoboferawelabaloxovo.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/vujatikenum.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/jipopekiwubuxemarugodix.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/8702347523.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/luxoxowofifotukal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+gta+5+android+from+ocean+of+gamesPDF 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 14976 bytes
SHA-256: bb86d2729bffc3368cb9ee8039e91676b9d73f4b86600fe27251b46c9e1292a6
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 11040 bytes
SHA-256: 36280fffb780917af4c12c9b55ad555ed4416ddd6635ea48b0a63286ebaa9f6c