Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c17d47059dcddb5…

MALICIOUS

PDF

117.5 KB Created: 2021-09-23 00:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39c9c67871f3d01ccb98ff51b2bd946b SHA-1: f1e1b7cda70956d1dcbb56d8ccd29eb266af9124 SHA-256: 1c17d47059dcddb5c83a2b65c3bd0f788d5fa06dfe844ac5ed891820ef72d198
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with a high number of external URIs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely to distribute phishing content or malware. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/6959622873.pdf In PDF document text
    • https://nls.vn/upload/files/52970266454.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/2219884554.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/wavekozewujukavoxag.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/22616106013.pdfIn PDF document text
    • https://webrobogo.hu/kepek/46005940555.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/fosojisujogen.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/71330243367.pdfIn PDF document text
    • http://att-na.com/upload/folezuxapetogadogusatusag.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/xopatozoti.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/99911927065.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/23506569788.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73376302300.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/62288019331.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/damajuzomaziwisemubu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/bugalulomo.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/mazozi.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/jusur.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/namabepubetuxawedet.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/33963663278.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jisatadesuririgoginiz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413359892e6---tidisotejera.pdfIn PDF document text
    • http://punaide.com/userfiles/files/32962218858.pdfIn PDF document text
    • http://agilesolutions.in/uploads/giwitakapumun.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/xavaxufonebibizuxomawaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=coleus+lower+classificationsPDF 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_off0001636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636E 19500 bytes
SHA-256: 92bf092d20cc2016a0581077b6a71e01c41ecf0e7d3ea3ab02b78b3cfe890151
font_01_sfnt_off00019651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ae68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE68 10548 bytes
SHA-256: 6b5b0ef0142e125dd8a5a9c49966a19577e902d8b4d3991b298bce0f28da5761

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