Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838dc68f95edde7…

MALICIOUS

PDF

44.3 KB Created: 2018-06-11 08:24:08 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 34e61a3e1a9267c16dbbc7de67b3d1f5 SHA-1: 2216fc72cd4161b6014b946b9b009ff609d83501 SHA-256: 4838dc68f95edde7d1e4f2a31546cbbc46c23f4fa02c555a7e6daf3f0e9ff744
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as an external URI pointing to a PHP download script. The presence of a 'download button' heuristic further suggests a lure to download content. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the combination of these factors indicates a likely attempt to deliver a malicious payload via a deceptive link.

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=sri-aurobindo-apos-s-dramatic-theory-and-practice.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://www.investhtt.com/online/sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://www.casadeanimales.com/reads-online/sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://therat.de/sri/aurobindo/sri_aurobindo_apos_s_dramatic_theory_and_practice.pdfIn PDF document text
    • http://bestregister.com/sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://dentistabrugherio.com/file/sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://www.abridgeofhope.org/s/a/sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://www.qubit.com.ve/sri-aurobindo-apos-s-dramatic-theory-and-practice.pdfIn PDF document text
    • http://archive.cx/sri/aurobindo/sri_aurobindo_apos_s_dramatic_theory_and_practice.pdfIn PDF document text
    • http://www.maisieandmaudefw.com/download/doc/investment-analysis-and-portfolio-management-10th-edition-solutions-manual.pdfIn PDF document text
    • http://refurs.de/leyl/245/leyl_245_workshop_manual_pdf.pdfIn PDF document text
    • http://asian.cx/answer/basic/answer_basic_methods_of_structural_geology.pdfIn PDF document text
    • http://ginobi.de/3d/qsar/3d_qsar_in_drug_design_vol_1_theory_methods_and_applications_reprint.pdfIn PDF document text
    • http://riverside-resort.net/1/span2000-course-outline.pdfIn PDF document text
    • http://riverside-resort.net/1/things-i-wish-i-d-known-before-we-got-married.pdfIn PDF document text
    • http://riverside-resort.net/1/towards-a-new-europe-stops-and-starts-in-regional-integration.pdfIn PDF document text
    • http://riverside-resort.net/1/the-selling-of-new-zealand-movies.pdfIn PDF document text
    • http://riverside-resort.net/1/tourism-paper-grade-11-november.pdfIn PDF document text
    • http://riverside-resort.net/1/the-political-system-of-the-islamic-republic-of-iran.pdfIn PDF document text
    • http://riverside-resort.net/1/the-route-to-purchase-a-guide-for-customer-officers-and-brand-managers.pdfIn PDF document text
    • http://riverside-resort.net/1/touchstone-2-chechpoint-answer-key.pdfIn PDF document text
    • http://riverside-resort.net/1/solutions-and-reactions.pdfIn PDF document text
    • http://riverside-resort.net/1/separate-peace-contemporary-classics-study-questions-answers.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_off00006566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6566 13532 bytes
SHA-256: 055c15d9af715611934254cc4ae9afbbbaf7d3898c01490b76e944aeeb4ef056
font_01_sfnt_off00008ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC4 8368 bytes
SHA-256: b6ecb84c9dc5db08b8ec7834b905feeca9ca477921a6d9d16cc0d1199701a3f4