Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc1b4cb2e4ee50…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 19:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bb6f7f03ce62a66aa5a089033174df9 SHA-1: 328032d7b472d660ff5daf6ada8c0a0acad04a64 SHA-256: 23dc1b4cb2e4ee50093638c0c827f6b87aa5bc2319e5376db673f8e2c3081cce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=how+to+recover+facebook+password PDF link annotation
    • http://aodaiminhhanh.com/app/webroot/uploads/files/mijolujiwodavuxewim.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/27214648326.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/31536722993.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/birapepojufozunas.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109130421566404.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dubozototejuvenijifafum.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/koxubibinibeb.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/62336729795.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/6450644960.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/zajupibutapesezivebuvaza.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109032336103673.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/92867947944.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6750981305.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/99880537872.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/mopewaruru.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3c9b7a387706aad6f6e121d1cc2240b6/60837499812.pdfIn PDF document text
    • https://agermag.ro/mm/file/damopugi.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/70759477411.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/10901357328.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xolutuxure.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/288546306.pdfIn PDF document text
    • http://intertravel.hu/_user/file/18349067471.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/lamutukujeduwugonesijo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc1b32c61---15152290172.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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 10744 bytes
SHA-256: 3072023c7f38885eca66b1e4a1c75a41c6e4641023fc1c9766c42472372d33bd
font_02_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 18240 bytes
SHA-256: 75acbb8c51fc0faca5de5cf926d45f263a6e5604e383e055142d5b471a9c99e2

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