Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0928073b7da618…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 14:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5eca09cfcdce8abae947d284546cb3ac SHA-1: 78cbc91a54a4ddaca2e5b805c0f7cc82710b0622 SHA-256: fa0928073b7da61875347693029cde3228920826fd5b9bfe260c77087eb69f81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348f6901f65---nibugalitew.pdf In PDF document text
    • http://studio70.eu/userfiles/files/30188772918.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/57023963444.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/pozutidipipapimupomumigev.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/97604562997.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/matomadilodo.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/voxigusabuxibotuvakap.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/disenifizarok.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/biwomeleguziwegipelofi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6f65a2890e9de43be6a5f951352b1fde/dulifanixekamojizoboxu.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/retovapibobeverawotidut.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/9541658593.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/zikuxifazu.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wojijubi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/faxaxigoguw.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/33635070258.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/nitaxaf.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/77474501838.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/tazuwi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/zufopinodapenezovu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/sadimejasuno.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/67439031407.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/fefutefeguginaxigogije.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zomasizupu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/mopufaloxetume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pubg+mobile+obb+file+2020+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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 10900 bytes
SHA-256: ed4e010f25cd39b83d163596c6a1606db0da20f019f3ba38005dac0ede996fb8
font_01_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 19460 bytes
SHA-256: 342eedb28465b497f0b0614f6525d5f3f21f3b5bbf1995129de4fceeda105122
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1