Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7d2e6d857ef876…

MALICIOUS

PDF

29.5 KB Created: 2018-06-11 09:19:40 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8ab359786e2f47e44a6e2880dbce234 SHA-1: 7e75447c43d28207b79721618acb484863894452 SHA-256: bc7d2e6d857ef876bae3b78b7a78d2685e1af3906400543e52ebb4e84e5da838
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 0.9525

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=subsea-engineering-handbook-free.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=subsea-engineering-handbook-free.pdfIn PDF document text
    • http://www.iceweb.com.au/sis/sis_index.htmIn PDF document text
    • http://uncpbisdegree.com/1/the-sex-starved-wife-what-to-do-when-he-lost-desire.pdfIn PDF document text
    • http://uncpbisdegree.com/1/ut-md-anderson-cancer-center-houston-texas.pdfIn PDF document text
    • http://uncpbisdegree.com/1/zombie-apocalypse-fightback-mammoth-books.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-science-of-supervillains.pdfIn PDF document text
    • http://uncpbisdegree.com/1/windows-xp-screen-resolution-settings.pdfIn PDF document text
    • http://uncpbisdegree.com/1/una-aventura-espacial.pdfIn PDF document text
    • http://uncpbisdegree.com/1/works-v-2-loeb-classical-library.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-shadow-of-wind-cemetery-forgotten-books-1-carlos-ruiz-zafon.pdfIn PDF document text
    • http://uncpbisdegree.com/1/touchy-feely-nativity-usborne-touchy-feely-books.pdfIn PDF document text
    • http://uncpbisdegree.com/1/unc-campus-landscape-design-guidelines-university-of.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.slb.com/services/subsea.aspxIn PDF document text
    • http://www.slb.com/resources/software/ihandbook.aspxIn PDF document text
    • http://www.glossary.oilfield.slb.com/Terms/e/equivalent_circulating_density.aspxIn PDF document text
    • https://en.wikipedia.org/wiki/Petroleum_engineeringIn PDF document text
    • http://www.glossary.oilfield.slb.com/In PDF document text
    • https://www.scribd.com/document/149888721/Corrosion-allowanceIn PDF document text
    • https://www.shell.com/investors.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://en.wikipedia.org/wiki/Blowout_In 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_off000039fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39FB 9736 bytes
SHA-256: 74f358e927c02d5e77f3d0804a76fc167678620d08b94864c6ad6eada576e465
font_01_sfnt_off00005926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5926 7384 bytes
SHA-256: 838ab3fcc41085d875fe877acf50659236361f391184c2149db09735502ca64c

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