Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15ae9184ed1e82d…

MALICIOUS

PDF

29.7 KB Created: 2018-06-11 08:41:23 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 3b0db5421317a533c4bd2b50870004a2 SHA-1: 7fd2474dc4068b9d71954738b25724f198ec1c5f SHA-256: a15ae9184ed1e82dccc2a24d06ea37d20fbf69d811e9f0056671d724e34be7ce
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9686

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.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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=user-guide-samsung-galaxy-s3.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=user-guide-samsung-galaxy-s3.pdfIn PDF document text
    • http://blog.clove.co.uk/2012/11/07/samsung-galaxy-s3-mini-user-manualuser-guide/In PDF document text
    • http://www.samsunggalaxys4manual.com/In PDF document text
    • http://www.boeboer.com/samsung-galaxy-tab-3-7-sm-t210r-manual-guide-wifi/In PDF document text
    • http://androidfact.com/galaxy-s3-update/In PDF document text
    • http://uncpbisdegree.com/1/the-big-silver-book-of-russian-verbs-2nd-edition-big-book-series.pdfIn PDF document text
    • http://uncpbisdegree.com/1/siemens-2402-telephones-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/study-in-italy-for-free.pdfIn PDF document text
    • http://riverside-resort.net/1/where-is-the-hubble-telescope-now.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-great-equations-breakthroughs-in-science-from-pythagoras-to-heisenberg.pdfIn PDF document text
    • http://riverside-resort.net/1/wiring-diagram-cat5-wall-jack.pdfIn PDF document text
    • http://riverside-resort.net/1/waec-2015government-answer.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-girl-fitness-guide-expert-coaching-for-the-young-woman-who-wants-to-look-and.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-df50-outboard-motor-service-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-digestive-system-the-human-body.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.samsung.com/us/support/owners/product/galaxy-tab-s3-wi-fiIn PDF document text
    • http://www.samsung.com/global/galaxy/gear-s3/experience/In PDF document text
    • https://en.wikipedia.org/wiki/Samsung_Galaxy_S3In 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_off00003799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3799 10712 bytes
SHA-256: da91636528c21322d87022b339ae08cd5dcc855e6c6cf45114dabffe89940368
font_01_sfnt_off0000599f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x599F 7516 bytes
SHA-256: 2a8edaca5802b8a5c77886e6ab72d025104eddb4b05ac11cd4f29739eede4021