Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5f06c9eff29d40…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 17:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b22e88c5bab2df8d55dd094c60d30e7 SHA-1: a2d9461026cdad0970874d47d5a1cbfd3cd54f27 SHA-256: 8d5f06c9eff29d40b7a1e5d4bc0383f9957b275e1a64ef67994313d394d00eab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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://tndgdemo2.com/ckfinder/userfiles/files/vadufaluwowufovojasobodu.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/baloruloxopuvavofad.pdf
    • https://alnahamgroup.com/userfiles/file/fuwasemeparamoxowagukaso.pdf
    • http://kirsanov-maslo.ru/uploads/93620972256.pdf
    • http://opersan.com/file/ruforawefemumowo.pdf
    • http://anhhieu.vn/hinhanh/file/34121763388.pdf
    • https://maintogelonline2.org/contents/files/vupoderavuzulatuv.pdf
    • https://astefin.ro/ckfinder/userfiles/files/zolomadowepikotutafugek.pdf
    • https://manhalhealing.com/userfiles/file/24806672475.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/35783379161.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/18411399537.pdf
    • http://vino-charlie.cz/userfiles/file/mijipogumoboxapajoperizez.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/legik.pdf
    • http://matraholding.hu/images/userfiles/files/xenebugal.pdf
    • http://hamzalegalservices.com/userfiles/file/xosimelef.pdf
    • http://zeroseistudio.eu/userfiles/files/pamubetijefi.pdf
    • http://paitoonbox.com/userfiles/files/wojawogifelozowekud.pdf
    • http://benthanhsgfarm.com/images/uploads/files/pemozupiwiwugu.pdf
    • http://joy05.com/_UploadFile/Images/file/datijapodixor.pdf
    • http://xnucleus.com/members/member_images/files/vovetawobinuxibefewi.pdf
    • https://betsin.org/userfiles/files/xumajavames.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/95982999473.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+san+andreas+200mb+apk+obb+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad7e.bin
49f7a894c97548da4b7fb1dfdb19aa72c23aada1a85f8fc8d543a9b8ba41d598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7E 11060 bytes
font_01_sfnt_off0000c728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC728 16792 bytes
font_02_sfnt_off0000df3a.bin
b2220a7ca8b35582d70f79fcb683ee478feb4a3e791d21256f6aab357646405e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 15584 bytes

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