Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4d36371e0c415d…

MALICIOUS

PDF

44.1 KB Created: 2018-06-11 09:32:31 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ef17f786c4a4e8ad98c2fc5d3374e7f7 SHA-1: 68922031400810d16826c563d2a17c4031b10ffc SHA-256: 1c4d36371e0c415dab5dcafbeb046fdbceef917d8cf373f21b75fa85974eff52
130 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness in this PDF. The presence of multiple external URIs, including one explicitly labeled as an external URI, suggests a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure, likely directing users to download a malicious file from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9065

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-african-grey-berks-county-bird-club.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • http://bestegypt-travel.com/reads-online/the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • http://castlevillez.com/pdf-reader/the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • https://hjagroup.co.uk/books/083929/the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • http://samsungml1660toner.com/the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • http://www.casadeanimales.com/reads-online/the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • http://isodat.de/the/african/the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • http://www.nfkchem.com/download/doc/the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • https://supershinecar.co.uk/books/083929/the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • https://dtecta.co.uk/books/083929/the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • http://rawest.de/the/african/the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • http://cigarbbguide.com/reads-online/the-african-grey-berks-county-bird-club.pdfIn PDF document text
    • http://angugg.de/the/african/the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • http://uncpbisdegree.com/1/senior-certificate-exam-papers-2012-english-paper-2.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-chrysanthemum-and-the-sword.pdfIn PDF document text
    • http://riverside-resort.net/1/workshop-manual-yamaha-xv750-virago.pdfIn PDF document text
    • http://riverside-resort.net/1/waterproof-comic-book-boxes.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sonic-automotive-employee-reviews.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-fourth-dimension-sacred-geometry-alchemy-and-mathematics.pdfIn PDF document text
    • http://riverside-resort.net/1/what-my-mom-taught-me-about-money-a-financial-guide-for-teens-and-young-adults.pdfIn PDF document text
    • http://riverside-resort.net/1/walmart-economist.pdfIn PDF document text
    • http://riverside-resort.net/1/uranus-temp.pdfIn PDF document text
    • http://uncpbisdegree.com/1/takeuchi-tb014-parts-manual.pdfIn PDF document text
    • https://hjagroup.co.uk/.../the_african_grey_berks_county_bird_club.pdfIn PDF document text
    • https://supershinecar.co.uk/books/083929/the_african_grey_berksIn PDF document text
    • https://dtecta.co.uk/.../the_african_grey_berks_county_bird_club.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=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_off000064fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 13404 bytes
SHA-256: 4cf2032083a058ef5fee6d56c00a79208f349593f967ef3b1b3470a28c4ab1de
font_01_sfnt_off00008e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6B 8220 bytes
SHA-256: 9ddbad9b53fa7a94ac41bbe2a68b8671b0c44ba1a30b609eda83bb03d646300f