Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe43abc1dd0f335…

MALICIOUS

PDF

99.6 KB Created: 2021-09-09 20:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c50acf700913e7be2f2dd4cc1ad8dabe SHA-1: e5445002cb2489e30d3acdd965839a8a9b4e9fb8 SHA-256: 5fe43abc1dd0f335d32769961908cefed8a485b929030fe93d6817cea27a20ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://synerhu.ru/uplcv?utm_term=chal+mera+putt+2+torrent+hd PDF link annotation
    • http://ecoaga.com/documentos/file/56783239834.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ketuviletowitisaxakexov.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/rojuwilumalizas.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/posaravotanojizuxokusiw.pdfIn PDF document text
    • http://roocenter.ru/upload/file/99571329963.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/40604944661.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/27470910727.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/020206207045.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/88557954110.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/1108502956.pdfIn PDF document text
    • https://viettrungson.com/media/Files/70208163330.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/tominesixabumixowasigise.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef57ddce7---lilefobo.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109092001232805649ndwi5.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/79782776548.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kknu4c23j89hmr9pnmn2vldean/27961667501.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/23442793766.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/toguradiriwuputewowap.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/58001702945.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/31325836358.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/81206600458.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/fejopavujinikijolal.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/gulapiwevupe.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_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 10648 bytes
SHA-256: 409b84d032eda5046cbfb8806750b4e1bda5493643470066fb10b3ac5b49d90c
font_01_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 20140 bytes
SHA-256: d3a55c025a101596a6c713f9c3d73961333e5d84cac49b691150b30e0eb3a4b4
font_02_sfnt_off000167d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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