Malicious PDF — malware analysis report

Static analysis result for SHA-256 e375a59875536f06…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 04:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 158890599400c7e408de73b90d903753 SHA-1: 9fbf6978390a090742b73097a7c1c23430fafdd6 SHA-256: e375a59875536f065f345ea84eb0aa5253c39101a96e2e7a8396590ca660ab74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://mmsmarin.com/imgimage/file/21516169009.pdf
    • http://brenderup.ro/mm/file/ramonujelew.pdf
    • https://0286869143.com/editor_images/files/sumana.pdf
    • http://hcstonetw.com/uploads/files/202109061318176397.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d345fa3650cc2e32681e2f3942c0ae27/zamaragowidosazodatekuko.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/newevinuremegilof.pdf
    • https://careersourcechipola.com/files/public/tunuwininoveradidedejefib.pdf
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/63676438074.pdf
    • https://brihat-group.com/assets/userfiles/files/mabesemex.pdf
    • http://cp-1.ru/userfiles/files/muwukexojuwotulifofemoba.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/fugiwofetirefaleririvusu.pdf
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/33028135443.pdf
    • https://tipresentoio.it/images/file/49276535042.pdf
    • http://chiangmai-clean.com/user_img/files/66309382145.pdf
    • http://camelliafb.com/uploads/files/202109092053439465.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/nokuduluzugojipu.pdf
    • http://apart1day.ru/file/veput.pdf
    • http://irpuyesh.com/cache/fck_files/file/68906514429.pdf
    • http://sieuthicayxanh.vn/webroot/img/files/tusovane.pdf
    • http://perles-del-beya.com/userfiles/file/33273475322.pdf
    • https://canionglobal.com/FCKeditor/file/45949824961.pdf
    • https://congnghiepxd204.vn/upload/files/10945091518.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=imo+download+for+mobile+app
    • 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_off0000dbde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 16792 bytes
font_01_sfnt_off0000f3f0.bin
049c3992f3a0f9eb1b6333f0a907e5a26a4261eb5b75302b85389b8f670c643c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 18000 bytes
font_02_sfnt_off00012217.bin
1470ff8707caf401124e03ba1ed34b643a8ea698a5cdf1c3064992086d5da960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 10572 bytes

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