Malicious PDF — malware analysis report

Static analysis result for SHA-256 8594cb653a62a9e6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 13:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37805002f35891a5403eb41f6ab4251a SHA-1: b1d62fa15aeb35ba52d9d7ce453ab27d799b9180 SHA-256: 8594cb653a62a9e66383fc8b54cfe1d31bb4977af644dd92be16fe5dc9217c26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it's designed to lure users to potentially harmful sites for phishing or malware distribution. The PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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.
  • 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=words+that+start+with+c+to+describe+someone+positively PDF link annotation
    • http://jorkurojus.com/userfiles/file/xebibuf.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/riluwuligi.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/98831551488.pdfIn PDF document text
    • https://ocw.tw/uploads/files/53662141927.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/galodozijabiluzop.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/50798214062.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/dateni.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/44281621221.pdfIn PDF document text
    • http://ledins.lv/cms/file/demixexizujekug.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/derenimuxenuwotetivewi.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/93629934894.pdfIn PDF document text
    • http://scantech3d.com/files/69027319071.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/pewuv.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/45946083685.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/rafazonusawoduxova.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/68956798012.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/48819718365.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/newikojevuvusil.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/demesizexeweluk.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/wodopudilaxawuxes.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/56472240143.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/jetekikubulugotagupuli.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/88418853718.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/jobefejezorebadika.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 17476 bytes
SHA-256: 19d5f441f4dceaafcb357fd6bbf203d7b28f0c2138a3f9624ab13030433e2fe7
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 11176 bytes
SHA-256: 47e78f2989f2f4604b1a8de479a8ddf4cd61a989e79962109dd9855f13e5e76d

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