Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50228a5aa20bd0a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 20:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b523ff32c0c3aba8652192e0e05ad00 SHA-1: c69025d52065dfee2f15c64181c5209da199d7a6 SHA-256: e50228a5aa20bd0a9e76e08d4b3d7da327dabd3a5c1b09f58ce9816c086b9ebc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution scheme. ClamAV also identified this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://metalltechnik-kutschi.at/rimeduva.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133a933adc47---kumobadaweji.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/65144705659.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jedaloguwilifa.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/7302056992.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/senigozipuzizepokifod.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/petotezekodinezusevaxi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2a6699ec4cc6d7b21bc8b74f2074f62f/kezuduz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9cb9591a67f7556de0406fb2027ff805/nudosod.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/81868227231.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/71271662271.pdfIn PDF document text
    • https://mimpidia.com/contents/files/tofuxebuj.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/53058699647.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/94151138938.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/13484072872.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/lukupegazafipobo.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/42380763954.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/19058319325.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/gefudowigafoteline.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/majekunezuv.pdfIn PDF document text
    • http://erpos.sk/data/files/21048281815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=centipede+arcade+game+unblockedPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/38269640739.pdfIn PDF document text
    • 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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 16336 bytes
SHA-256: b85405baebb151f28ba5d25074ce355a9d53a3d05bb7244b9c31b2312ebea578
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 11052 bytes
SHA-256: c24be2d4c276be30e7aec1b9cd097bf82fedc481930ff132af460e4593cbff9d

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