Malicious PDF — malware analysis report

Static analysis result for SHA-256 117a1c7a3cad8757…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 22:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c38422212360fcf63628bbc5cd9648c8 SHA-1: 089a300f04c196a360d8fbbb428fe7b8446e3ed5 SHA-256: 117a1c7a3cad8757b17df98cc95064ae57bd3d94987dc202443f014cf7523134
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. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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 http://smolninskayahotel.com/userfiles/file/faloji.pdf In PDF document text
    • http://cieplej.pl/imgturysta/file/23437800943.pdfIn PDF document text
    • http://i-dron.cz/data/file/24519164632.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/70264233988.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/pefenaxivaguweli.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/43454997273.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090805355173499.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/gobizew.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/sanogabovopevejupiburote.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907052513019062yy4xla.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/buvixiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4247a0698---7809347727.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/99982433576.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bedef5ab49f76f52bf63fbbab64fb153/jipex.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/tepifepumabopimogasimutif.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/61300216072.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/23578352110.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/92127587803.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/jebetedazagorilojid.pdfIn PDF document text
    • https://banghenails.com/upload/file/lovotodoriwavobiw.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35241271161.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/tagezoteru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+heart+rate+app+androidPDF link annotation
    • 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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 17180 bytes
SHA-256: cbca222cdbb181c54945bb307f7785054d9a56983c5a480b139f8493c5570e07
font_01_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 10496 bytes
SHA-256: 20b7b8a26771e2fbffae2d2dfb906c99b17296ad66f9059d5c89651dd685f081
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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