Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d610f670648097…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 04:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b7d1f0524c591996d72e752bf97f37e SHA-1: 128e12f40d6bfd90676435ead4ae8b7c13ef0ce1 SHA-256: 56d610f670648097791ea786f7e26ab7d3b9fd828084b7d99b038fb44265c512
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on low-reputation hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=redmi+go+software PDF link annotation
    • http://narnivet.com/userfiles/files/41303897514.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa9a2d3a2---mapakoporosejikedadew.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/86793880234.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109050200559023.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/repatuvagoxotisema.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/94109488782.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/38076576567.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tegajez.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/datowavuminaf.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/ripanejutijobuvenel.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazawalav.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/warebepalipofev.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd60b4ec0c---ritazikomo.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/xobixosagesitudinuwa.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/jezudesakazefitarolenu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lokukuwi.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/29977744600.pdfIn PDF document text
    • https://protum.se/file/23889942394.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906093454.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/72477115977.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/98723351914.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/54513683059.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/jodufukitarixali.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/pebot.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_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 10676 bytes
SHA-256: 1d13246645f8efd659c4af83888ffd4b061823293150ccb13bda6da4ce1cd1b8
font_02_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 18284 bytes
SHA-256: 050d54f9fc5cb5eb220d7ac0392db0327792f2fe461129d9401467970b2cb8e9

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