Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3960fd84c19844…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 08:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef05d33bf072a8d814ee54af54837cfb SHA-1: cb36cff461e9b1e7455b3ea4d84dc0a160b799c5 SHA-256: 6f3960fd84c19844767f01ed05f3e922f1982eb4bb0835bbc972ec29e94991ff
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://eltdb.com/UserFiles/files/zigimow.pdf In PDF document text
    • https://ghnservizi.com/file/34219381192.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/386dbf112c52fe0a28d8c14a289accf1/zufinalikozisovasim.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/30583224095.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tusibufokolo.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/patedixip.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/lariwof.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/29966545706.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/46371815371.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/gevon.pdfIn PDF document text
    • https://anaksemut.com/contents/files/benorusomof.pdfIn PDF document text
    • http://opersan.com/file/fedewademupibowo.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/35541552412.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/riwisamiwipadetiw.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/pukujawonixegezupareburix.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bowefusipuzuse.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/32160209651.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/seketenuwifatiloluxunoko.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/36012381227.pdfIn PDF document text
    • http://sissonne.hu/editor_up/40298360660.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137671298dd5---zurofotekuzux.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/72574974502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=auto+likes+without+loginPDF 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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 17828 bytes
SHA-256: 2493ab5fd7bd3c6a38d09f421c49cbcd5801f7d8637656a8022321e38c2b9e9f
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10384 bytes
SHA-256: 9cd7a51010772689152b0136d0c2dcf8579a432ad56859955d89b60d814993e9