Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf46f063e6f10af…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 01:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4a5456c883eb4181e545e955f96b528 SHA-1: 1475893be421b97daf23bc28587da9425304b79e SHA-256: bcf46f063e6f10afb680f78e07ed97afdfa4a06c0a8ee70d37fbef05d067bfad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to PDF files on disposable hosting, suggest a link farm or phishing campaign designed to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://one9five.com/userfiles/files/zimanipizuv.pdf In PDF document text
    • http://airconbank.com/upload/fckeditor/file/50241416857.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/rilesajedajedexozilan.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161415e161ddb9---41937408580.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/57127835560.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/96272510521.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210917/16318262028034.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/watirabidopudo.pdfIn PDF document text
    • http://4bx.pl/public/file/kuxudokokabujo.pdfIn PDF document text
    • https://5udua.com/contents/files/tamomo.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/dogusigemeruf.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/9904604958.pdfIn PDF document text
    • https://sanidom.pl/img/file/15459375761.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/66118181905.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/dufisefuni.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/fiwovesusajeserixujefaz.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27402784545.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fa85de4---somuxazujazexupuwo.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40317563667.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/66647758344.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/wezigo.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_212000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=asphalt+8+unlimited+money+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 22104 bytes
SHA-256: 276988518400f7ba97103c7859ec5cec69f9aa3e14766e608df2cede2cbd7dbd
font_02_sfnt_off000131b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 11140 bytes
SHA-256: df8cba12c6a7ac4e3694bdd20a2b178e9419e9bea20d218acb2d65c4cb65971a