Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ad0fe191017293…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 00:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d8c75d3448069af6ec556ecbbb9dc9a SHA-1: 579640cc6c284d1cf2d7ed6b591b83c90971fa1c SHA-256: 88ad0fe191017293367dc2f75acc714225657f1ed57373a2b121a4dd21c0f831
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://curry-box-deluxe.de/userfiles/file/bipalanafulibenanufojulo.pdf In PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/470782926.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/95777698653.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/84543188189.pdfIn PDF document text
    • https://preciseenergygroup.com/media/lomotewukot.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/47831939464.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/91213669021.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/xaxuriw.pdfIn PDF document text
    • https://hobbypet.cz/files/file/ginepifatimokikozakovezel.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/vedam.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fa5e49959b69b6c617fa5b5520291f63/6825032647.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/38a4692676b80cf1d3fc978ba698517c/furakijawikimiziwaleg.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/9961520514.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/pupedozokoxasapivagosi.pdfIn PDF document text
    • http://wami.cc/data/files/lowijukalijuralovo.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/judodumiditevemunilumipi.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/20787654561.pdfIn PDF document text
    • http://chengzechem.com/upload/files/66253978214.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/39107461374.pdfIn PDF document text
    • https://purefeeling8.com/data/file/55780456617.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/11247705427.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/kebifezurefetitikutujovev.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/julirawalutojuze.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/jizepolubimud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=most+word+processing+software+can+be+used+for+which+3+of+the+following+tasksPDF 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_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 11480 bytes
SHA-256: 35c0adbf57d22ed18f09141b88c77bffc0b6bd166eb1d35f5f47dd752ea0e332
font_01_sfnt_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 15028 bytes
SHA-256: 9ee9a892962d0df1572bc70532aa01d02c5de91c953b7d7d24b6abe26b83d024

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