Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa3e502c0e0569b…

MALICIOUS

PDF

96.9 KB Created: 2021-09-10 20:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d7401b1055330afa01a69b2a0a1dfe0 SHA-1: 743b946c9509a755170d917e1133e1346fcd524f SHA-256: cfa3e502c0e0569be9ac8f246673c1cb1a7942bcb831a588d0e1c090423f31f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to potentially compromised or disposable domains, further supports a phishing or malicious download attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nguyenphat.com/public/default/ckeditor/files/ladipetupawagotidegadapez.pdf In PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/68591556418.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/84400741639.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/40126668870.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/7646273380.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/40962178709.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/61447595880.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/41753274620.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/sipofulalevetanexuxuv.pdfIn PDF document text
    • http://christopherdallo.com/file/11154450372.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/51963735996.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/77592994322.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xamitinid.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/pavabutud.pdfIn PDF document text
    • http://levotst.com/uploads/files/tafebogujelavobodesu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130675b1fabc.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/35671065736.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/ligumemopexoxudivonom.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/giralugurefita.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/68787265417.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/95374386038.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/98561632376.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/gosegotuvubonuw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e1b3304f3---tazoxutenufo.pdfIn PDF document text
    • https://e-room.co/userfiles/file/39159906494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=balloon+defence+5+unblockedPDF 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_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 10528 bytes
SHA-256: b1d4cc7eb25852a2c28f86235914f81cb925416b19b382bbba49c0f810ae2ab5
font_01_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC7 20496 bytes
SHA-256: d3985a7a5348ae09832e44c8023af801805967c7c8eb3e2f916d56caf92e8f75