Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cea1456fd0cd08b…

MALICIOUS

PDF

45.2 KB Created: 2018-06-11 08:50:52 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0c8f3988dcd157a2ab04f840c2e8090a SHA-1: 7914d50f315d4fd2b19e6a0dbbf779119201d866 SHA-256: 3cea1456fd0cd08b808457d19003f00df3cded84269accb898c379cf9a0ee69b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by a machine learning classifier and heuristics indicate it is a fake download lure using SEO poisoning. The document body contains multiple URLs pointing to external resources, likely intended to trick the user into downloading a malicious payload. The primary attack vector appears to be social engineering to facilitate user execution of a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8643

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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=undachtigr-lebens-wandel-und-stanislai-kostka.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=undachtigr-lebens-wandel-und-stanislai-kostka.pdfIn PDF document text
    • http://www.androinnokia.com/reads-online/undachtigr-lebens-wandel-und-stanislai-kostka.pdfIn PDF document text
    • http://drcool.de/undachtigr/lebens/undachtigr_lebens_wandel_und_stanislai_kostka.pdfIn PDF document text
    • http://www.rambahadursinghcollege.com/reads-online/undachtigr-lebens-wandel-und-stanislai-kostka.pdfIn PDF document text
    • http://www.papercdn.com/reads-online/undachtigr-lebens-wandel-und-stanislai-kostka.pdfIn PDF document text
    • http://www.exearn.net/doc/pdf/archive/undachtigr-lebens-wandel-und-stanislai-kostka.pdfIn PDF document text
    • http://openminds.solutions/undachtigr/lebens/undachtigr_lebens_wandel_und_stanislai_kostka_.pdfIn PDF document text
    • http://www.kitchenideass.com/u/l/undachtigr-lebens-wandel-und-stanislai-kostka.pdfIn PDF document text
    • http://riekko.de/undachtigr/lebens/undachtigr_lebens_wandel_und_stanislai_kostka.pdfIn PDF document text
    • http://uncpbisdegree.com/1/speaking-truth-in-love-counsel-community-david-a-powlison.pdfIn PDF document text
    • http://riverside-resort.net/1/zealots-of-masada-story-of-a-dig.pdfIn PDF document text
    • http://riverside-resort.net/1/workshop-book-for-engineering.pdfIn PDF document text
    • http://uncpbisdegree.com/1/self-reflexive.pdfIn PDF document text
    • http://riverside-resort.net/1/visiting-card-design-logo.pdfIn PDF document text
    • http://uncpbisdegree.com/1/ski-doo-safari-parts-diagram.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-journal-of-john-wesley-enhanced-version.pdfIn PDF document text
    • http://uncpbisdegree.com/1/short-stories-questions-and-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/surface-area-of-a-prisms-and-cylinders.pdfIn PDF document text
    • http://uncpbisdegree.com/1/simpsons-comic-book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.amazon.com/Undachtigr-Lebens-wandel-Stanislai-Kostka-German/dp/1286109108In PDF document text
    • https://www.amazon.com/books-used-books-textbooks/b?ie=UTF8&node=283155In PDF document text
    • https://www.amazon.com/History-Books/b?ie=UTF8&node=9In PDF document text
    • https://www.amazon.com/Europe-History-Books/b?ie=UTF8&node=4935In PDF document text
    • https://core.ac.uk/display/63314246In PDF document text
    • https://www.amazon.in/Undachtigr-Lebens-Wandel-Stanislai-Kostka/dp/1286109108In PDF document text
    • https://www.amazon.es/Undachtigr-Lebens-wandel-Stanislai-Kostka/dp/1286109108In 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.amazon.in/Undachtigr-Lebens-Wandel-Stanislai-Kostka/dp/In PDF document text
    • https://www.amazon.es/Undachtigr-Lebens-wandel-Stanislai-Kostka/dp/In 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_off000067b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B3 14364 bytes
SHA-256: dad11303165f24c42044deedf6cc1916fb4cbeeaab21102326b4eee71badf18b
font_01_sfnt_off000092d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 7992 bytes
SHA-256: 204ebd564cc98b45edfe416d8f2c227fea104072da3499af5c221b9e085df1ad