Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51dbde7cfca05ec…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 02:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fde1138219393760e32eda446a983891 SHA-1: fc4f8a2b3973a37b1d24ecc00a815228a33d866b SHA-256: d51dbde7cfca05ecddeb0a736f8220c69f3fcbe0f7b7955f1d38f6d18baba8fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a large number of external URIs, many hosted on disposable domains, suggests it is designed to redirect users to phishing or malware download sites. The document body is unreadable, but the heuristics point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://coretry.ru/uplcv?utm_term=dragon+mania+legends+cheats+2020 PDF link annotation
    • http://studiospazioambiente.it/userfiles/files/tegigubaguvo.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/50818703416.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/15723788520.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/sufotevesiluwexeji.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/96892317884.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/72020787681.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/junix.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/11073688612.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3fcdad5585f47abd6c7ea68a9af8f17/90443499094.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca9471b45b---posunokalopepopuju.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/satovajuxalunepexofej.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/namabunoziwasesag.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913095851652753.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/84201261614.pdfIn PDF document text
    • http://houselandia.ru/files/22424192361.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/talap.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/11640614043.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210902044511.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632008568904787825.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135980711f95---xavinoposi.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fozubo.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_off0000afe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE6 15900 bytes
SHA-256: 0cd684e06d8ccfc61af9ee99883a998088a9bb7d111cd9aa56fc7e8900cf677d
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 11060 bytes
SHA-256: f51dc9e01b37928520d1a2b9cffd2555861a6155ebd639b5bf84010bb39a731d
font_02_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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