Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64f3d2f8092fb04…

MALICIOUS

PDF

29.4 KB Created: 2018-06-11 09:20:07 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 1b401983c3888f3f046a60a3fcea1452 SHA-1: 7097297f8c55bab762e085cf080f2d8f99f262bf SHA-256: a64f3d2f8092fb04e481a77960d18853e1c3edfec792fc0cc80c3297e9cf86b4
130 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by the presence of external URIs pointing to potentially malicious download locations. The document body and heuristics suggest a lure to download a file, likely a second-stage payload. The SE_DOWNLOAD_BUTTON heuristic further reinforces the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9110

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=signing-naturally-units-1-6-aslta.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=signing-naturally-units-1-6-aslta.pdfIn PDF document text
    • http://deafdigest.net/category/jobs/In PDF document text
    • http://uncpbisdegree.com/1/sensio-ice-cream-maker-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/test-for-geometry-37.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sylvania-stc984-user-guide.pdfIn PDF document text
    • http://riverside-resort.net/1/when-a-loved-one-falls-ill-how-to-be-an-effective-patient-advocate.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-ira-the-irish-republican-army.pdfIn PDF document text
    • http://riverside-resort.net/1/valuing-employee-stock-options-wiley-finance.pdfIn PDF document text
    • http://uncpbisdegree.com/1/summit-bi541bfr-refrigerators-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-complete-potter-sawdust-firing.pdfIn PDF document text
    • http://riverside-resort.net/1/what-really-happened-to-humpty-from-the-files-of-a-hard-boiled-detective.pdfIn PDF document text
    • http://uncpbisdegree.com/1/social-anthropology-in-india-some-fascinating-and-unexplored-dimensions-1st-edition.pdfIn 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=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_off000035e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35E9 10940 bytes
SHA-256: 4eeee0eb324fd1aa8fd41468241fcc68ed1cae06f038a11c9ed72c5fc633a01c
font_01_sfnt_off00005868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5868 7460 bytes
SHA-256: 337f1d4fa880d9bff4326cb53c05ede89d07d46a88a7571e2f7f4edb742ef069

Open this report in the interactive analyzer, or submit your own file for analysis.