Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b05ca611cdaa64e…

MALICIOUS

PDF

26.9 KB Created: 2018-06-11 09:49:00 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-06-20
MD5: bab79385e97341f2680cbc1db8ffe237 SHA-1: 7285804d8c69b9634451ad5c9c53da34e2c3087b SHA-256: 8b05ca611cdaa64e5d4966521f37173e148b27db458aadbf083ff7e3be1d79f1
102 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier and a specific heuristic for being a fake download lure, directing users to external URLs. The document body contains obfuscated text and multiple links, including suspicious ones hosted on 'uncpbisdegree.com' and 'riverside-resort.net', which are likely intended to trick users into downloading malware. The presence of these malicious links and the fake download lure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

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=stedman-apos-s-conci.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=stedman-apos-s-conci.pdfIn PDF document text
    • http://riverside-resort.net/1/the-truth-about-princesses.pdfIn PDF document text
    • http://riverside-resort.net/1/smoke-in-the-sand-the-jews-of-lvov-in-the-war-years-1939-1944.pdfIn PDF document text
    • http://riverside-resort.net/1/terapiia-na-kozhnite-i-polovo-predavani-bolesti.pdfIn PDF document text
    • http://riverside-resort.net/1/trane-tcont803as32da-thermostat-installation-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/ufo-revelation-the-secret-technology-exposed.pdfIn PDF document text
    • http://riverside-resort.net/1/technical-service-bulletins-by-vin.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-vios-service-repair-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-rebellion-of-the-hanged.pdfIn PDF document text
    • http://riverside-resort.net/1/study-guide-answer-key.pdfIn PDF document text
    • http://riverside-resort.net/1/twelve-transgressions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00003007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3007 10520 bytes
SHA-256: 86dd4677f1e0517026b3cbc6ed0fa400d80d11ca92ffff56751cb5f234ab8a1d
font_01_sfnt_off00005160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5160 6596 bytes
SHA-256: 10e14588521ac4ba1801bdeb3ed6b4697e6dc3ea53b5cc74084c30933a39f9cf