Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90263aa1c2e79db…

MALICIOUS

PDF

68.0 KB Created: 2021-09-16 05:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a25733cb1ea6da532b79ed2a98484587 SHA-1: f726fda128b818f8ffaf40c3b0c3e54f6fcd2608 SHA-256: e90263aa1c2e79db5385876be8ca76f31e9c14c8269c68ed6e97236b6460fc66
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=worms+3+android+free+download PDF link annotation
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/91646621253.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/87950047005.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/83825931118.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/xomig.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/51185373398.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/pexosazufotixixatanobozej.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/50658516872.pdfIn PDF document text
    • http://irths.com/upload_files/files/70580259195.pdfIn PDF document text
    • http://bubb.cn/up_file/file/wanifigovopuvotiv.pdfIn PDF document text
    • http://esistore.com/userfiles/file/mekojude.pdfIn PDF document text
    • http://soupworld.de/upload/file/savuwedudifufusemikola.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/nebibop.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109151631505099.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/vatugoxa.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/82090703040.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/62545830050.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/donezivisoziruzevelur.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad98e9afa5---19501175553.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/boxubejuri.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c35e40536fdfe3761faa82bbc81c17b/62773389097.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/42898995297.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109131246243188.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/72049369395.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/15215242542.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_off0000ae16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE16 14324 bytes
SHA-256: 08000d2383b25f2376a0f44204cc8542a2fd18cca66e4bcbe54bdcb262227245
font_01_sfnt_off0000d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C3 10668 bytes
SHA-256: abbf43a090a91ba8ce1643b0aa7c6011c23cc2587de94b922a3fb769215ca180
font_02_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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