Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13515127ac56e25…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 06:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a1f38221b9b4debadddf0eadc1bf204 SHA-1: cbc11d96035fdae35f9d73ef93dfe26e502ea807 SHA-256: b13515127ac56e25e7586ab96e18fb13f94aa4108f029cd3241eb4c677b49bed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous links to external PDFs hosted on diverse, potentially disposable domains. The presence of a link farm suggests an attempt to distribute further malicious content or conduct phishing by luring users to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rentbucharest.net/images/userfiles/6609658582.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/78438657721.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-3/20210903050113807574.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/54259495.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dumewifemugukig.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912230136465.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/82420660219.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/50577498275.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/12390297144.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/lotelinusogiba.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/dunovaxepilawepunimufibid.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/17514786374.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/58871399593.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/wibogidij.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/95814336860.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/vudodukeliwofo.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/devodituvenuxitezat.pdfIn PDF document text
    • http://adveotec.com/img/file/59931158661.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/27818482.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/82794623149.pdfIn PDF document text
    • http://moneymaker-gold.de/files/20954244268.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b8e0d7384cb919f392c53822a880f468/89905141315.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gunuxegiluwesekulojo.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/muwuzapebuxuradita.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/weduvufowedogedofeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kannada+bible+pdf+free+downloadPDF 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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 14956 bytes
SHA-256: 0f3e43e9faac55694e54fc26ccbbb05734d2715ff84f8115c088ff96d576e6ad
font_01_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 10440 bytes
SHA-256: f9e9c1172b3c0d0e928722833e598ece9a6d7427be51a2e8ce3928fd90471d7c
font_02_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1