Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d755d7d2f9c332…

MALICIOUS

PDF

48.0 KB Created: 2018-06-11 08:10:44 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 8c2dd50af554ae8823fc38a4fa94492d SHA-1: 5dca84d78a029994725f53038a6481d56058abc4 SHA-256: 53d755d7d2f9c33273f2840bce306362038ed6e94935817dc82b578a8915a3c9
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9023

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uncpbisdegree.com/download3.php?q=staging-nation-english-language-theatre-in-malaysia-and-singapore.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=staging-nation-english-language-theatre-in-malaysia-and-singapore.pdfIn PDF document text
    • https://openresearch-repository.anu.edu.au/handle/1885/27524In PDF document text
    • http://asian.cx/communing/with/communing_with_the_spirits.pdfIn PDF document text
    • http://asian.cx/emergence/of/emergence_of_language_development_and_evolution.pdfIn PDF document text
    • http://ekmtop.de/manitou/engine/manitou_engine.pdfIn PDF document text
    • http://riverside-resort.net/1/team-fouls-in-basketball.pdfIn PDF document text
    • http://riverside-resort.net/1/service-manual-aprilia-leonardo-150.pdfIn PDF document text
    • http://riverside-resort.net/1/two-hundred-patterns-of-haviland-china-volume-3.pdfIn PDF document text
    • http://riverside-resort.net/1/the-sweets-of-araby-enchanting-recipes-from-the-tales-of-the-1001-arabian-nights.pdfIn PDF document text
    • http://riverside-resort.net/1/todo-el-amor-1970-1995.pdfIn PDF document text
    • http://riverside-resort.net/1/the-billionaire-s-obsession-the-complete-collection.pdfIn PDF document text
    • http://riverside-resort.net/1/touched-by-you-books-1-4.pdfIn PDF document text
    • http://riverside-resort.net/1/solitary-reaper-poem-question-answer-class-9.pdfIn PDF document text
    • http://riverside-resort.net/1/the-tapping-solution-by-nick-ortner-2.pdfIn PDF document text
    • http://riverside-resort.net/1/the-usborne-book-of-castles-internet-linked-usborne-complete-book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://muse.jhu.edu/article/188397In PDF document text
    • https://muse.jhu.edu/browse/film_theater_and_performing_arts/theater_and_performance_studiesIn PDF document text
    • http://www.jstor.org/stable/pdf/j.ctt2jc7b6.7.pdfIn PDF document text
    • https://www.researchgate.net/publication/273829386_Staging_Nation_English_Language_Theatre_in_Malaysia_and_SingaporeIn PDF document text
    • https://www.cambridge.org/core/journals/journal-of-asian-studies/article/staging-nation-english-language-theatre-in-malaysia-and-singapore-by-lo-jacqueline-hong-kong-hong-kong-university-press-2004-xi-227-pp-4950-cloth/8386B756A8CCB222409727917BD1BF2DIn PDF document text
    • https://www.questia.com/library/journal/1P3-866581761/staging-nation-english-language-theatre-in-malaysiaIn PDF document text
    • https://www.hkupress.hku.hk/pro/849.phpIn PDF document text
    • https://muse.jhu.edu/book/5762In PDF document text
    • https://muse.jhu.edu/browseIn PDF document text
    • https://muse.jhu.edu/browse/social_sciencesIn PDF document text
    • https://muse.jhu.edu/browse/social_sciences/anthropologyIn PDF document text
    • https://www.amazon.co.uk/Staging-Nation-Language-Singapore-Jacqueline/dp/B00LXERJOCIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://www.researchgate.net/publication/273829386_Staging_NationIn PDF document text
    • https://www.cambridge.org/core/journals/journal-of-asian-studies/In PDF document text
    • https://www.questia.com/library/journal/1P3-866581761/stagingIn PDF document text
    • https://www.amazon.co.uk/Staging-Nation-Language-SingaporeIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000724b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724B 14344 bytes
SHA-256: 5087e40811c2210e71f9695d926673db3ec51942e4471a0e312d4b956cd5e9d8
font_01_sfnt_off00009e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E39 7784 bytes
SHA-256: 524e36168db7ae2e4d5fd411438f9e8ae5cd2baf84f64ef44552b161ce8f75f1