Malicious PDF — malware analysis report

Static analysis result for SHA-256 3566b047742ec208…

MALICIOUS

PDF

33.7 KB Created: 2018-06-11 08:24:15 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: dec03a560defb0fcaf6fd2631c4d3a62 SHA-1: 70de2e86e0275ca62ceabd1d8b030fe9d2364f66 SHA-256: 3566b047742ec208c161f937eafe060c101102d2235f96b46f19abbd17c5b128
130 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and a heuristic firing for an external URI, specifically pointing to 'uncpbisdegree.com'. The document body, though partially garbled, includes references to an art exhibition and download links, suggesting a lure to trick the user into downloading a malicious file. The ML classifier also flagged this PDF as malicious with high confidence.

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.
  • 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=the-1992-international-invitational-exhibition-of-contemporary-ceramic-art.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-1992-international-invitational-exhibition-of-contemporary-ceramic-art.pdfIn PDF document text
    • http://www.magdaleneodundo.com/resume.htmlIn PDF document text
    • http://watson-fitzgerald.com/In PDF document text
    • http://www.kondo-kyoto.com/About/IndexIn PDF document text
    • https://532gallery.com/artists/In PDF document text
    • https://532gallery.com/postindex/In PDF document text
    • http://joanmitchellfoundation.org/work/artist/bioIn PDF document text
    • https://gadsdenarts.org/exhibitionsIn PDF document text
    • http://www.ohimuseum.com/11th_toshio/profile.htmlIn PDF document text
    • http://lichtensteinfoundation.org/chronology-2/In PDF document text
    • http://www.artgalleryofalgoma.com/main-gallery-exhibitions.htmlIn PDF document text
    • http://mexic-artemuseum.org/exhibitions/In PDF document text
    • http://lichtensteinfoundation.org/exhibition-history/In PDF document text
    • http://biotechnics.org/artists.htmlIn PDF document text
    • http://bridgeport-art-trail.org/artist-of-the-month-2/In PDF document text
    • http://www.digitalthistle.org/type/aside/In PDF document text
    • http://www.exonumia.com/sale11/alla.htmIn PDF document text
    • http://hamburggermany.men/Hamburg-Germany/Hamburg-Germany_bq.phpIn PDF document text
    • http://uncpbisdegree.com/1/template-for-a-training-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/usury-statute.pdfIn PDF document text
    • http://riverside-resort.net/1/unnatural-selections-a-far-side-collection.pdfIn PDF document text
    • http://riverside-resort.net/1/user-manual-for-lg-tone-hbs700.pdfIn PDF document text
    • http://riverside-resort.net/1/wireless-lan-systems.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-complete-book-of-pregnancy-amp-childbirth-sheila-kitzinger.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-outboard-spc-schematic.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-mvc-cd250-digital-cameras-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-ipad-resolution.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sparks-3-workbook-answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=JA_EN&a=http%3a%2f%2fwww.ohimuseum.com%2f11th_toshio%2fprofile.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/University_of_DallasIn 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_off00004751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4751 10592 bytes
SHA-256: e1ae1e84e3e672f936b13028ac974eabaa6f7c033686a32aabc374d9241f8686
font_01_sfnt_off000068f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F8 7204 bytes
SHA-256: 9430228ad218fff02b170a11051b92199c759348ab11082daeba644def5d3751