Malicious PDF — malware analysis report

Static analysis result for SHA-256 e723bcdb3ed61a4e…

MALICIOUS

PDF

82.7 KB Created: 2021-10-08 00:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf41491024a3d38c133ecd5df7c42560 SHA-1: c3b9ab99b918cef4201b79af6fa154c51d1c8cfa SHA-256: e723bcdb3ed61a4ebb9cc5c2e877c35854721239b818b3992ada3e50df694b5a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the PDF's structure as a link farm suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=explain+k+means+algorithm+with+example PDF link annotation
    • http://signauction.net/userfiles/file/bixutazajirakesegegepukuw.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/xovitimijikigubep.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/paxasodekadamokije.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/guxabiwijalo.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/56364972471.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tiximame.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/tivelumi.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/likatalovikajiwobenubujok.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/xopeb.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/fojugeku.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/dikonefaxaboterapexub.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/vesexemetirumimaki.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/janave.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/98235573112.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/texosugulopigiradabosid.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/jigimujo.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/wibijufuweza.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158bea954aa0---52628364389.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/82868067984.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615a6e79af5ce---vigasukeguzowik.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/28361557325.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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 19896 bytes
SHA-256: 465f1554b2238add69e40e94b2a12baa9d883ffac059f5ac3b07f3be7406fbfa
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 10960 bytes
SHA-256: d1bf160738616ecf2211b87f4b2b67dc13f1a6943757a54144f47995a98759b7
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1