Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6e2baf55f31eaa…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 05:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f91d9c67335d4611e6ef52638cc9d431 SHA-1: 6a4484e8c643c3e7ffb6ca106f50d346b2757b96 SHA-256: 4d6e2baf55f31eaab3a1fafb4314279b4f891918898c1a7ed7367f573c7ae4f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm on disposable hosting, directing users to external websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs suggests an attempt to redirect users to download further payloads or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=chrome+web+store+download+for+android PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b73e413969---22123573032.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71106069525.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/39865109818.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/11545490652.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/80411910817.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/raneponosefanikavuwife.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxoselozeganibar.pdfIn PDF document text
    • http://sns.hu/_user/file/26462174564.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42016008023.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/94096314805.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161427c32420a4---36518577656.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/16322305095.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/pasaw.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/nevijire.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sokokinimalakipomuduneze.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/rarifepotaxas.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/mudinawarugatexudesuko.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/safelolilolemoribo.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109132054407858.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/bugazo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/dexeporurexebuzixurane.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/53454264603.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/56211936683.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/58379481444.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23072918697.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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 16552 bytes
SHA-256: a13036470c6844065c4cfcdbcbb007564961e6bd6ad6ed5cb7d8e884bd58f6c1
font_02_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 10876 bytes
SHA-256: c4236e2ffeed321a81003f023e86c388a18f84f4f2269d4f83af1ef8e4294d9a

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