Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccabaa8fb6ff47fa…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 15:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b5bc3025321e1110881f80e73fef53b SHA-1: d5566c533c1ac71be84440954dea9df7484a3bdf SHA-256: ccabaa8fb6ff47fa2c0462d11c84bb3f22e4139060a1b9b39ece90539342a876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.natursany.com/ckfinder/userfiles/files/sumogixamamon.pdf In PDF document text
    • http://mweb.cz/images/file/71478848982.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/laxugoretowazadoxewibex.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/95111054930.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/30925920297.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/kunotibif.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136d32412e9f---53003306787.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/gorupinuropafeg.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/jawoguvoperikobenuwiwej.pdfIn PDF document text
    • http://specimport.by/files/files/fapijetuzuzuj.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/q7Btc8URHbZn.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341dc10a002---jifakufefosuvizitulof.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/96735134734.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630667716.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/goxezasawijawepatipif.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/kisobilidokoturokepifu.pdfIn PDF document text
    • https://polaria.cz/images/file/zagilesudugulolo.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210902122718.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wesewuvikefiwatetinep.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/23427738603.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/gelaxasezefejus.pdfIn PDF document text
    • https://el-tall.pl/pics/file/zidoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hobart+mixer+a200+manualPDF 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_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 17084 bytes
SHA-256: 6c872e294a8a5a9c4535c452f04d3a7c4062cf27d8b35445ae304e2d7655f09d
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10676 bytes
SHA-256: 5a1ce43a66978e747cad209fe24157b9a64ab774ca79907b6f04132fabbca37f

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