Malicious PDF — malware analysis report

Static analysis result for SHA-256 259c24c4a00d307a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 14:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5f124d33debb9ffb835e44d151c1b40 SHA-1: 7388ade8a726d6bae67566729c645fb53064f4fb SHA-256: 259c24c4a00d307a35212df698b648fc89002e3584ceb6785c4014c5d301e6fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for redirecting the user to one of the numerous external URLs found within the document, which are often used for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=stock+android+status+bar PDF link annotation
    • http://g-shocktou.com/user_file/file/tuketisofubexoruxage.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/vexitugokuxupusij.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/dijikulakoxanofagovelile.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/73130958447.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/27897690027.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/zuwotiz.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/difototomalelojorojip.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/86740985475.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/tataxo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/684567bd4affd08c68ed4d2647697cae/sosijetut.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/vujasunusatanunazuretov.pdfIn PDF document text
    • http://abpaluso.com/upload/file/42194705503.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/kuxumojar.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/84795319264.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/vuzipipubov.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5c31c66f---muvulevupi.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109151858451051.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/kizejigi.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/boteleranun.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/53891123912.pdfIn PDF document text
    • https://medius.sk/userfiles/file/gakip.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/womudira.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xinudorazozi.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/lotilomanokuv.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_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 10592 bytes
SHA-256: 1c618f14c9f94cccc3a4f12b94ac1a9f3d525fdfe9217177fb5d268e2f181e13
font_01_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 18028 bytes
SHA-256: 110efb17f550f8bdc968b76c351756a9fdb507e3f7039dcfc3620171e5aa51b3

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