Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3cae78f63b9044…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 00:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0886706351e9c904c742a4d02580dc5b SHA-1: beda74376d9ef273c29835a682f1b1c9ffc6bce4 SHA-256: bf3cae78f63b90448838fcccedf54e41e8e4823a33c7076ed34557d1c137bcd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smirna.pl/files/file/zonelo.pdf In PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/56498892152.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/bupen.pdfIn PDF document text
    • http://apart1day.ru/file/veput.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/26256042698.pdfIn PDF document text
    • http://apismorava.eu/docs/66936781019.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/40225786958.pdfIn PDF document text
    • https://cardolf.ro/files/27439770777.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/dixezelepopafi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc76eb316f---xasojotixasus.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/12603217300.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/ditamukew.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/wekop.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/40257706234.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/lifedanusewolemazoga.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nuhdhtj35a20kf0cddua8anekq/zukijiwamebepiwoxitu.pdfIn PDF document text
    • http://upakuika.com/img/file/19931686927.pdfIn PDF document text
    • https://rajaunited.com/contents/files/polexunaj.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/4576054310.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/kibamudix.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/2320186087.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/xizunosarugelaxokebepu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/49182564783.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/33313389380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=windows+live+account+loginPDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 18240 bytes
SHA-256: d5c92e40664d5d991b99beb203cb5eebcfa6ed0486e3a6770bd5025d150ecaac
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10688 bytes
SHA-256: fcf59319c31090c91610f0bed4fe463c883a97ccffe25571876cea06394438e7
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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