Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe39677f983991d…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 13:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c219a498e67633cec35e6a175c130a3a SHA-1: 83a5df1bb1719c31a4bc2d43b394de243466d02f SHA-256: cbe39677f983991de01839d6c0c2013d766a9d99fd1fe901a2000943e820069b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drafthe.ru/uplcv?utm_term=fortnite+android+system+requirements PDF link annotation
    • http://kanalizace-ul.cz/userfiles/file/koniwogowunap.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614c43cb00edc---sekivolasurazuxewesures.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/70533156319.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/megexolutamoruduli.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/26810360482.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/13493465510.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e9bc9d9a2d7eed5f2681eff38d6bccac/6802655379.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/lepotekepebabawaf.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/javazamiwijutu.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/65533635153.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/geniterowus.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/38323302526.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/majoxakix.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/wusemezifutis.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210909182133.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613fe4055ec90.pdfIn PDF document text
    • http://kelvista.lt/images/files/97654716022.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/24675712595.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/89167589446.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mufate.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/nujapax.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/42015747288.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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 10700 bytes
SHA-256: fcd9c508c9ce518fa73f63d463e4cdc4cf03d3ee188182c302003d0d6b39932e
font_01_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16072 bytes
SHA-256: 07873ec4edb0506b44a3b9c96844fff37217089e5391c44ddc3d4f3e16810c15
font_02_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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