Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a7999fb03031aa…

MALICIOUS

PDF

31.2 KB Created: 2018-06-11 08:18:59 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 78bd6763ac01dedf415770bf1887f1f3 SHA-1: b13ca5f0c71e63a0da5ce771ffdb084a4269144b SHA-256: 38a7999fb03031aa324eea94031b2c9c268f9556567480e2f9b0f4fb39a649fa
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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-classic-sainte-beuve-and-the-nineteenth-century-culture-wars.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-classic-sainte-beuve-and-the-nineteenth-century-culture-wars.pdfIn PDF document text
    • http://www.tfp.org/revolution-and-counter-revolution/In PDF document text
    • https://essayerudite.com/In PDF document text
    • http://riverside-resort.net/1/service-manual-trucks-volvo-f7-truck-workshop-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/solar-car-design-project.pdfIn PDF document text
    • http://riverside-resort.net/1/south-dakota-history.pdfIn PDF document text
    • http://riverside-resort.net/1/the-making-of-a-mediator-developing-artistry-in-practice.pdfIn PDF document text
    • http://riverside-resort.net/1/the-hundred-years-war-modern-war-poems.pdfIn PDF document text
    • http://riverside-resort.net/1/tomtom-xxl-530s-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/serway-physics-solutions-6th-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/surah-fatiha-1-answering-christianity-the-noble.pdfIn PDF document text
    • http://riverside-resort.net/1/the-middle-child.pdfIn PDF document text
    • http://riverside-resort.net/1/thermodynamic-of-solution.pdfIn PDF document text
    • http://www.horntip.com/html/books_&_MSS/1920s/1922_my_life_and_loves__frank_harris_In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/Western_canonIn PDF document text
    • http://www.jstor.org/subject/literatureIn PDF document text
    • http://www.gutenberg.org/browse/titles/pIn PDF document text
    • https://en.wikipedia.org/wiki/The_Spirit_of_the_AgeIn PDF document text
    • http://gutenberg.net.au/ebooks15/1500221h.htmlIn PDF document text
    • http://www.loot.co.za/index/html/index1330.htmlIn PDF document text
    • http://www.loot.co.za/index/html/index4597.htmlIn PDF document text
    • http://oll.libertyfund.org/titles/acton-the-history-of-freedom-and-other-essaysIn PDF document text
    • http://sentence.yourdictionary.com/inIn 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_off00003e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3E4F 10652 bytes
SHA-256: a65d5a54892cec72ee7977e20cb3f283c1ecbd7c56404597a45718ee7997b065
font_01_sfnt_off00006016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6016 7160 bytes
SHA-256: aee4de6a996f97e2d40fce2ba3d8f524394ab0b7cebb446b1ddf5993f47d7106