Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b7d08ba5a3eee9…

MALICIOUS

PDF

32.6 KB Created: 2018-06-11 08:59:11 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: c56f0758f60ab733ccb4fc2e722ad0b4 SHA-1: 5c14ff714dc5fcb00298bd91617cc3b230093c4e SHA-256: 09b7d08ba5a3eee903651ca419c58a0172cf317d7ea127c5c614b1d600e3a9dd
102 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a fake 'free download' SEO-poisoning lure. It embeds multiple URLs, with the primary malicious gateway being http://uncpbisdegree.com/download3.php?q=study-guide-for-cadc-exam.pdf, which likely serves a malicious payload. The document body also contains references to study guides and certification exams, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9340

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=study-guide-for-cadc-exam.pdf
    • http://uncpbisdegree.com/download4.php?q=study-guide-for-cadc-exam.pdf
    • http://www.adacbga.org/exam
    • http://www.iaodapca.org/credentialing/counselor-2/
    • http://ibadcc.org/
    • https://odapca.org/
    • http://www.mcbap.com/exams/ic-rc-exams/
    • http://www.iaodapca.org/credentialing/counselor/
    • http://www.adacbga.org/conference
    • http://www.eapassn.org/NewJersey
    • http://www.naswnj.org/?LicensingFAQs
    • http://www.burrellcenter.com/about/clinical-staff-southwest-missouri/
    • http://www.southark.edu/admissions-enrollment/student-advising-coaches
    • http://howtoexportimport.com/Types-of-Export-Containers-995.aspx
    • http://www.orangepsych.com/vitae.htm
    • http://uncpbisdegree.com/1/solutions-spivak-4th-edition.pdf
    • http://riverside-resort.net/1/work-and-family-an-international-research-perspective-applied-psychology.pdf
    • http://riverside-resort.net/1/why-join-a-trade-union.pdf
    • http://uncpbisdegree.com/1/similar-solids-project-answer.pdf
    • http://uncpbisdegree.com/1/solar-car-electrical-design.pdf
    • http://uncpbisdegree.com/1/student-solutions-manual-to-accompany-concepts-of-modern-physics-arthur-beiser.pdf
    • http://uncpbisdegree.com/1/tahoe-chevy-2018-tahoe.pdf
    • http://riverside-resort.net/1/villa-la-angostura.pdf
    • http://uncpbisdegree.com/1/solution-center-msi-taaclaaccharger.pdf
    • http://riverside-resort.net/1/vw-self-study-books-automatic-transmission.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://alcohol.nv.gov/Licensure/ADBC/CADC/
    • http://alcohol.nv.gov/Licensure/ADBC/LADC/
    • https://study.com/steps_to_become_a_doctor.html
    • https://study.com/directory/category/Medical_and_Health_Professions/Medical_Residency_Programs.html
    • https://study.com/directory/category/Medical_and_Health_Professions/Medical_Residency_Programs/Medicine_-_MD.html
    • https://cws.auburn.edu/directory/
    • https://en.wikipedia.org/wiki/Law_clerk
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409
    • https://go.microsoft.com/fwlink/?linkid=868922
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409
    • http://go.microsoft.com/fwlink/?LinkID=617297
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000446d.bin
6bc59c0b2241d4d1a185e1d8820d3791e164000d1b007791e9858edfbbb62aac
pdf-font-stream PDF embedded font (sfnt) at offset 0x446D 9916 bytes
font_01_sfnt_off0000641d.bin
24c425b3f7b83818087e124067087fa985bf46005f20b826565ed6e22a2f26f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 7236 bytes