Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcce9f5fd670cfa…

MALICIOUS

PDF

75.1 KB Created: 2021-09-27 18:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a16b65c06b14b8af8f1a2fb5956bce6 SHA-1: 558c1a1345dce33769c157da90fa0486b30ea3e8 SHA-256: 9bcce9f5fd670cfad691e4005228da257d8e7083320af8699ef20fea7d4a87d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://archism.ru/uplcv?utm_term=reading+mode+chrome+android PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf47da1f0---wilurasokulujusap.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/zojusatemadesibet.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/65184896251.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/78101751272.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/7731404537.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/5070813072.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/68539808823.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/redig.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/40417241158.pdfIn PDF document text
    • http://snft.ro/media/file/jusejoludamuxas.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zitororuzipibojekazideso.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/vofumilarapotebonemonozi.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/ritesivuniderolatumukokaj.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/wixupewazon.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lorojujazubugawekenibe.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/72616978184.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/dovadutigafavelaz.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/relagexebif.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/42347835798.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/logorewukupilef.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/runabivabezatonudenu.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/besawafijiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDC 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000c4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B6 10552 bytes
SHA-256: 765d3ef42c6d29a9470eb1001de463d2dcadeddbd6c58a4624e1fd7a762b8e3a
font_02_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 16652 bytes
SHA-256: 1447ff0a81677eb92a8c69d172ec274f5c9a9d2db4932521c2620ba3cce0d0da
font_03_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1