Malicious PDF — malware analysis report

Static analysis result for SHA-256 368d9ca057817e6b…

MALICIOUS

PDF

29.1 KB Created: 2018-06-11 09:05:49 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f580a202115a98baa090869110bb2cf SHA-1: 75bc00a87e83e8c7d8443f68f928c9248926bcae SHA-256: 368d9ca057817e6bfcfc0ea4839a49251d38d2e22c97555b044bd838273c451c
102 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious and contains heuristics indicating it is a fake download lure. The document body and embedded URLs point to a domain designed to trick users into downloading a file, likely a second-stage payload. The primary malicious URL identified is http://uncpbisdegree.com/download3.php?q=super-teacher-username-password-school-account.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9382

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=super-teacher-username-password-school-account.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=super-teacher-username-password-school-account.pdfIn PDF document text
    • https://www.superschool.org/superSchool/In PDF document text
    • http://uncpbisdegree.com/1/stihl-fs-48-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-global-supply-chain-simulation.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-faith-to-doubt-glimpses-of-buddhist-uncertainty.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-aisin-30-40le-transmission.pdfIn PDF document text
    • http://uncpbisdegree.com/1/snco-joint-pme-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-dr-100.pdfIn PDF document text
    • http://uncpbisdegree.com/1/staar-answer-key-april-2018.pdfIn PDF document text
    • http://uncpbisdegree.com/1/signs-alien.pdfIn PDF document text
    • http://uncpbisdegree.com/1/tales-from-the-swollen-corpse.pdfIn PDF document text
    • http://uncpbisdegree.com/1/statics-and-strength-of-materials.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.superteacherworksheets.com/comprehension.htmlIn PDF document text
    • https://www.superteacherworksheets.com/backtoschool.htmlIn PDF document text
    • https://www.ixl.com/signin/scsIn 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_off000038c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38C1 10172 bytes
SHA-256: c1bd282e5268d3ea52857ad004fb26f5cd7962ae42874908240ca661374080d0
font_01_sfnt_off0000592f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592F 6788 bytes
SHA-256: bc443a3ae1e4a9bf5ce3838bc01de0d5907082b76524d85c098a35d1362044bc

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