Malicious PDF — malware analysis report

Static analysis result for SHA-256 423c8424b7ced4ab…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 19:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53f42dc7ca894c421c4d36c25841ca63 SHA-1: 5132ff8395f145db291459b05b9fdd877b0deda2 SHA-256: 423c8424b7ced4abc18183491da696a14faa0c86a79d14e54e77cc198cd1d5b0
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's a link farm on disposable hosting. Although no executable scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious sites. The presence of multiple unknown reputation URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://kastely-vacduka.hu/fileok/file/nivirugixogofono.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/dafudotelunebiza.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/gudelonujomerilunaka.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///40763191680.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483cecde4---27048889843.pdfIn PDF document text
    • https://agrando.cz/files/file/9044455137.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/75473882836.pdfIn PDF document text
    • http://vhshf.de/File/97118862056.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dizewazimuparagoba.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/60197323584.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/degofetatoduva.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/82914512758.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/gobaridinobadovebi.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/zikuxu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/fewukonununowuximu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/7850124561.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/26422985394.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/jijadabisev.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/limevofutezoj.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/pevipurawasakugofowoz.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210906_205353.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345bbfe6e3c---22456994143.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/82559353819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=door+slammers+2+unblockedPDF 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_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 10792 bytes
SHA-256: 82d86de41f738a465a39d1c32b7e00b212c3ea09b72da3024f8966048cf52c97
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 17368 bytes
SHA-256: a254aef4c0e4cdd06440c83071f6f9d838b71e1de2bc05fa9682b6712bb29d21
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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