Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfba11d4932d1a83…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 04:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 66fbb13c981716f1b3d4a53bdd61d42c SHA-1: 52e010133ea9d1537b2cb56fa5bd46eb6d9b6380 SHA-256: cfba11d4932d1a83249cc01b793cdec7b46c79ddfcc1b85b8d018d04a16df01c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=babumoshai+bandookbaaz+movie+online+play PDF link annotation
    • https://b2b-intelligence.it/uploads/file/69196505870.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/41276007388.pdfIn PDF document text
    • http://gnox.vn/upload/files/belikugu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91819980285.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/66833757077.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/rovaxatobuzarajivi.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/vikifolukukomalisikefun.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138deab09dfe---zepozotup.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xuterezego.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/biwaxegibuzegevorupikugij.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44875364532.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55792481661.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sozemedesomosapopepudon.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/41273933666.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/mewedunididejazonuxozibuf.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/46038555448.pdfIn PDF document text
    • https://turbooto.vn/upload/files/ruzufinufutojisizumitud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613539b5ebaf0---18785908727.pdfIn PDF document text
    • http://carbonelite.ru/file/92671829537.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/doberuzuruzejisopi.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210907_182608.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tesagezewekerokotedab.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909054438.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 17612 bytes
SHA-256: 634bf1afb6568c893ac2034960ae5110dad27081eeebec93968fc256f4eae54a
font_01_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001238e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 11084 bytes
SHA-256: 45e3a009c83f3ee5c6dad57185f24e8eea4e9aa386855eae397c71ea6d698bb4

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