Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fecb129456edbf…

MALICIOUS

PDF

67.3 KB Created: 2021-09-25 21:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca6b82fad3cdd5353044bac4943cf1cf SHA-1: 64e42c023e8ebe67ec5b453eedcad1afab842a2d SHA-256: 11fecb129456edbf4946a5bfe095ac08d41ed648e947d907d0b01d604300de65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to PDF files on various domains, indicates a potential link farm or redirection mechanism designed to lead users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://viettincapital.vn/upload/files/58443045329.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/15749383504.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/84481480583.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/bojotajipekapuzit.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/mozozatabutisa.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/lidajutunigobowirapi.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/jexejixetugowimodutemiru.pdfIn PDF document text
    • https://foulardfotografando.it/file/41066362610.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/97664575357.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/xujevidozu.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/75090914700.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/kofesem.pdfIn PDF document text
    • https://tele-video.ru/upload/files/42451676485.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/lusopawosavope.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/42021630743.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/472gto5o2na5j6mr9kea4akmel/80612231104.pdfIn PDF document text
    • https://wonkingchina.com/d/files/bukusi.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/63892589506.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/zanobabukosuxazob.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/wimuzobeligup.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/sidepuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=time+nomad+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_off0000acfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFD 14576 bytes
SHA-256: 868e941e86c33c372deb1cda7859de2e841d07747a6c176e187ca2f5a05bd4ea
font_01_sfnt_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10060 bytes
SHA-256: 5f09cf9839d878ac843e8cde6aa0639e4ac679cb02e28e8c98819838a2078649

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