Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87e9e180d6a940d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 834c0735d6f09384f18bcd6e6691218e SHA-1: 488e8c247c99da4b7482253b0d13fcd01b71fd79 SHA-256: d87e9e180d6a940d47b3c9a7268058db745e496ee4e9ea4a9f588dbfe6941d85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used to host phishing content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=3d+pool+ball+hack+tool PDF link annotation
    • https://deltaguvenlik.net/userfiles/file/futajisudiroxumebuvug.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/winevidewifudipufomisore.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/381334efa696e7602083a4470446e9ce/79152641117.pdfIn PDF document text
    • http://bulmarconsult.com/files/96880652236.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/mupoxokupanu.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/xemoveno.pdfIn PDF document text
    • http://unityproductions.com/upload/files/17670566494.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5814baf0fc244f191a26d31b5559aa8a/romodutalizawez.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/44297874835.pdfIn PDF document text
    • http://klinok-saintp.ru/files/zejib.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/81517208323.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/morobupotusokewumixe.pdfIn PDF document text
    • http://dentherapia.hu/files/file/velawefamewu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/89392570591.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/zalodoxu.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vijiva.pdfIn PDF document text
    • http://sinoorchids.com/image/file/sopazute.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nidol.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/81732771165.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/lajepazivujojafituposalif.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/53077812232.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/33544673627.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/muramepavebal.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_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 10320 bytes
SHA-256: 8a7c03a50754e235dbe1d5401bfaa75d154ed8fd90772110608903e90aaca0a7
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 17188 bytes
SHA-256: 0e0a7fe4738be69767610999570a06518d7396bebc063478f003ce43f2e0c190

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