Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be4699f919dd441…

MALICIOUS

PDF

97.3 KB Created: 2021-09-11 18:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19f8b1106085d0c4124d4f7aa2860620 SHA-1: 8152b1f7f197d3ae8b2f0a8cefa5711028edaf51 SHA-256: 2be4699f919dd441319a7c1a30ce602dee29fc1cc0fcc6a4157964e3da50e038
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://sangolongphuong.vn/longphuong/news/files/feremefo.pdf In PDF document text
    • http://z-sinpro.com/upload/files/6376048303.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/76203189300.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/61717133850.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/51728630563.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/kipegadivutusuzelemep.pdfIn PDF document text
    • http://feg.vn/uploads/files/mevuzubogetasozejipez.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/xepatixiposa.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40758842696.pdfIn PDF document text
    • https://heyratacademy.ir/file/59966171715.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kufojaxaz.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/65965310020.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/31602368706.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4eb47710f5855b8ef77932c0a0ea5d73/40343188921.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/80912728923.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/kulojugitekig.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/lutat.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/99551551582.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/45602199420.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/mojitudakubulimuw.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/mukisogevejaja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308521864ca---74476991487.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/siwaduwuxikewu.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/wakalelu.pdfIn PDF document text
    • http://nature-revive.org/files/file/12443459448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=invisible+cities+pdfPDF 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_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10388 bytes
SHA-256: 04f9dcf0982a1ddb81dafe565b3108893cc8b096a4095dd80ec97726570fd3bb
font_01_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C2 18600 bytes
SHA-256: 21f827a9a3c53b1e0337f676d58855b681a94f0204fb6085e705d823b685df7b

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