Malicious PDF — malware analysis report

Static analysis result for SHA-256 89da4244d36d3490…

MALICIOUS

PDF

28.8 KB Created: 2018-06-11 08:41:53 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c0b95962144598b747e92c771e96f257 SHA-1: dca993f75e865bb657e02c1f74dcfa307af2a24a SHA-256: 89da4244d36d34902af65b52e98269f80f808bb77ad131b09897e472d49210a6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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=test-larson-geometry-answers.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=test-larson-geometry-answers.pdfIn PDF document text
    • http://www.slader.com/textbook/9780547647142-larson-geometry-common-core/In PDF document text
    • http://www.slader.com/textbook/9780618595402-larson-geometry/In PDF document text
    • http://burnscamp.org.uk/liar-gary-paulsen-study-guide.pdfIn PDF document text
    • http://www.classzone.com/In PDF document text
    • http://joaniestrust.org.uk/sell-books-to-amazon.pdfIn PDF document text
    • http://uncpbisdegree.com/1/seeing-voices-oliver-sacks.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sociology-unit-2-paper-1.pdfIn PDF document text
    • http://riverside-resort.net/1/whatever-happened-to-the-hall-of-fame-baseball-cooperstown-and-the-politics-of-glory.pdfIn PDF document text
    • http://uncpbisdegree.com/1/tea-sample-answer-documents.pdfIn PDF document text
    • http://uncpbisdegree.com/1/statics-solution-5th-edition-bedford-fowler.pdfIn PDF document text
    • http://uncpbisdegree.com/1/statics-problems-and-solutions-hibbeler.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-darkness-within.pdfIn PDF document text
    • http://uncpbisdegree.com/1/seventh-day-adventist-minister-s-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/telecommunications-pocket-reference.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-great-domaines-of-burgundy-a-guide-to-the-finest-wine-producers-of-the-cote-dor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.bigideasmath.com/In 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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3811 9836 bytes
SHA-256: aa714fe2c2b7d0aec6137efa24be7707fb6fd65150ac928473950a2e8cc432df
font_01_sfnt_off0000575e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x575E 7020 bytes
SHA-256: fbfb17418502d41d26ef7c1634bb4768255f03c9f741d077fc19fbe563583c2c