Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fba248d6baf7caf…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 08:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd96da64b5ad58aef71fb4a8867550a3 SHA-1: 4acaba6d1dae65afaf12ffd2daa5cb70d439576b SHA-256: 5fba248d6baf7caff3ca35a7010eae274087a0f5cf2962af7d2b41083a490db0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is expected to redirect the user to one of the numerous external URLs found in the document, such as http://cautrucpalang.vn/webroot/img/files/zizalajedol.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cautrucpalang.vn/webroot/img/files/zizalajedol.pdf In PDF document text
    • http://jiab.net/userData/board/file/fakiputusewanuvebedazev.pdfIn PDF document text
    • https://ivanamihic.com/files/65059514697.pdfIn PDF document text
    • http://lse.hu/userfiles/file/64088593764.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/pibimunukunuzivebixeko.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/494177651.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lisatulalej.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/luzadibiwuxifuvemupola.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21090815263318137769oa5ten78mr.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/xoviz.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zaxunapakikizotuf.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kojowopalomewatujime.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/28243558413.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613764f9e0767---27887891040.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/69619670680.pdfIn PDF document text
    • http://thaide.org/userfiles/file/94613135585.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/67566624663.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/41509910011.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/1276593893.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/pevozi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109011852045173.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/wusegukonedojoxuvil.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/bekewefapetenanobud.pdfIn PDF document text
    • https://naves.cz/res/file/vipevewebezip.pdfIn PDF document text
    • https://lazerom.pro/media/file/getasa.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/tiletatugevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kotler+and+armstrong+2014PDF 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_off0000c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 10864 bytes
SHA-256: 602eed9e2bdbdb0f9849a6d72865589658809445a1f6bc1da7c7a4eceacf34dc
font_01_sfnt_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 17960 bytes
SHA-256: 2b426f21a23da175873356981cd03421bad89849daa94be8479083814c0a9d73
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1