Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6e9af1d3b84930…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 14:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12d3439d6eb9e59dd247561138ed5a61 SHA-1: 11605f1a98c6808bf3633720fbb8765e3079040f SHA-256: be6e9af1d3b8493040b336779e06b6cef43b3e99d62fe8d8b94afeaa3e60f076
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://maristaslardero.es/userfiles/file/41489808909.pdf In PDF document text
    • http://alburigiott.it/userfiles/files/92548090350.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/xebotoreno.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50e195cd6---kulijevubomesap.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/71303988989.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/xepalumuwo.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/warutipetunoxufidikot.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/92593968179.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63046733256.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/37758374421.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/62232470302.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/batutisusapojamivamigidiz.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/bodovafomimebamegitove.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wojawogifelozowekud.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/35650802014.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/53198299427.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/8628107853.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/28301528324.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kabegenupan.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/bidogorumuw.pdfIn PDF document text
    • http://cortabellanews.com/userimages/nigaziju.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/27475121452.pdfIn PDF document text
    • http://deltools.com/userfiles/file/sirutetupafo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/rudirowofogusenuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mi+tv+box+chromePDF 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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 18620 bytes
SHA-256: 53d48e499ba10a162c849b1d54d38d325fcda8413e5507cdab0176e77d5d6072
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10316 bytes
SHA-256: e3fcf6ce0ade2b20600dce0e78982cc01ad0e1be80558e2989ba8830b76e34ce
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1