Malicious PDF — malware analysis report

Static analysis result for SHA-256 7153781dbe90a108…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 10:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f42d690ce2206617be15b9b96a687d7 SHA-1: e6914665133602f35f3f5196cc3841646fa59d4f SHA-256: 7153781dbe90a108251fbe0819f894e32174add35b6134dfc4af44338093d7ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with critical and high severity firings. It contains an embedded JavaScript stream and numerous external URIs, indicating a phishing or downloader attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=ghd+live+cricket+match PDF link annotation
    • http://avs-market.ru/admin/ckfinder/userfiles/files/8327361955.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xikufuzozoluzaj.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161491f5646723---wufamizo.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/josobip.pdfIn PDF document text
    • http://askort.pl/Upload/file/90141787071.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632123854.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/65719538451.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/68852279906.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/kozunugowupokoluxuj.pdfIn PDF document text
    • https://o-dance.com/upload/files/numujetiro.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/89059127876.pdfIn PDF document text
    • https://labelmarket.pl/data/file/nebebanaropeposapen.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135d69bd5d4a---pudoz.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/18725189123.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/80072755700.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vuwixebedubujimerizuxigef.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/19360256968.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/larifozeburupabofobo.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/38682171175.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/wefipetite.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/zorosakorofezumojisat.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lofiradivoperuzemenapunid.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_off0000c152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC152 10440 bytes
SHA-256: eec50f6ad3144851473fffa55d65dab71cad0c0be573a8c041d87b2e85d3f24e
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16164 bytes
SHA-256: d07c38e307e942c1957165f48e86cb6b66e16e9955d12c38a767d31085b5ae1f