Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19bdad7095fe88d…

MALICIOUS

PDF

43.0 KB Created: 2018-06-11 08:39:17 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: c16680c55377dcc6a92a1f4500c5dce8 SHA-1: 3a79fa92db2955cb662c9ec3ac8ab8d934d43bb7 SHA-256: c19bdad7095fe88dcbdc607b76c35288c5318f89db16f35616c8acbf5eaa885c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains numerous URLs, many of which are hosted on suspicious domains and appear to be disguised as a smartphone manual. The ML classifier flagged this PDF as malicious with high confidence. The presence of external URIs and a visual download button lure suggests an attempt to trick the user into downloading a malicious file. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8423

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=smartfone-movil-n100-manual.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=smartfone-movil-n100-manual.pdfIn PDF document text
    • http://socobim.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://ceolta.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://linwave.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://zinstv.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://wundoc.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://elucom.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • https://christianlouboutinclearance.co.uk/a3363/smartfone-movil-n100-manual.pdfIn PDF document text
    • http://foyhoo.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://rawkus.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://sklera.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://cash4x.de/smartfone/movil/smartfone_movil_n100_manual.pdfIn PDF document text
    • http://illumineconsulting.net/smartfone-movil-n100-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-a200-manual-focus.pdfIn PDF document text
    • http://riverside-resort.net/1/study-guide-unit-3-periodicity-awnser.pdfIn PDF document text
    • http://riverside-resort.net/1/the-possessed-adventures-with-russian-books-and-people-who-read-them-elif-batuman.pdfIn PDF document text
    • http://riverside-resort.net/1/tesco-aptitude-test-questions-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/tro-chemistry-solutions-manual-online.pdfIn PDF document text
    • http://riverside-resort.net/1/soft-reset-iphone-4.pdfIn PDF document text
    • http://riverside-resort.net/1/strange-but-true-john-searles.pdfIn PDF document text
    • http://riverside-resort.net/1/tourism-june-exam-paper-2014.pdfIn PDF document text
    • http://riverside-resort.net/1/touched-by-the-boss-tempted-series-book-2.pdfIn PDF document text
    • http://riverside-resort.net/1/the-politics-of-duplicity-controlling-reproduction-in-ceausescu-apos-s-romania.pdfIn PDF document text
    • https://christianlouboutinclearance.co.uk/a3363/smartfone-movilIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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_off0000604a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 13892 bytes
SHA-256: 5d3e506b5d7759b604d3e18e78f0430696357c5f9363cabf54adaf280a24c27b
font_01_sfnt_off00008acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACC 7704 bytes
SHA-256: 9b5c9886002ffa82a47a9143e022406274274948ecd10af336a150c7c2c00d3f