Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b072a831f96e1f5…

MALICIOUS

PDF

31.3 KB Created: 2018-06-11 09:52:44 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 2d83c2a20b2e6fca49ee1d07d7d8ba94 SHA-1: 0380871d713dc83346df21cc77fab666e6d31cbb SHA-256: 7b072a831f96e1f5659d15ba4637a8f4b4d63690a235657134ed3d6e4a65847c
102 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a fake 'free download' SEO-poisoning document. The document body and extracted URLs point to 'uncpbisdegree.com', which is likely hosting a malicious payload disguised as a PDF. The presence of a download button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9276

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=the-hunchback-of-notre-dame-great-epics.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=the-hunchback-of-notre-dame-great-epics.pdfIn PDF document text
    • http://www.howtoteachyourchildrenshakespeare.com/In PDF document text
    • http://uncpbisdegree.com/1/sepedi-question-paper-3-grd-11.pdfIn PDF document text
    • http://riverside-resort.net/1/us-government-final-exam-study-guide.pdfIn PDF document text
    • http://uncpbisdegree.com/1/south-carolina-eoc-algebra-1-posttest.pdfIn PDF document text
    • http://uncpbisdegree.com/1/space-exploration-and-humanity-a-historical-encyclopedia-2-vol.pdfIn PDF document text
    • http://riverside-resort.net/1/universite-a-paris.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-ericsson-xperia-arc-s-manual-espanol.pdfIn PDF document text
    • http://riverside-resort.net/1/window-ac-wiring-daigram.pdfIn PDF document text
    • http://uncpbisdegree.com/1/textile-conservation-conservation-and-museology.pdfIn PDF document text
    • http://riverside-resort.net/1/volvo-240-wiring-diagram-for-a-c.pdfIn PDF document text
    • http://riverside-resort.net/1/uniden-dect1580-2-manual-en-espanol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Roadshow_theatrical_releaseIn PDF document text
    • http://www.filmsite.org/briefquotes1.htmlIn PDF document text
    • https://www.britannica.com/biography/Victor-HugoIn PDF document text
    • http://www.filmsite.org/1930-filmhistory.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Mulan_%281998_film%29In PDF document text
    • https://www.rottentomatoes.com/m/scaramouche_1923/In PDF document text
    • https://www.rottentomatoes.com/m/machete_maidens_unleashed/In PDF document text
    • https://www.imdb.com/title/tt0016220/In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Literature/TheIliadIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/UltimateBlacksmithIn 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_off00003e17.bin
193152a252ff0657c63a81e43fe812008a6634e5d4ab7c12853c4c369f9d2a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3E17 10552 bytes
font_01_sfnt_off00005f86.bin
4155bf9bb114086a6dc26453e7ed606d4afdea11f63485b88828924442f0f1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F86 7384 bytes

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