Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb7f6bead75cbe2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 21:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8216a91a574cfbc1f319e530ad07885b SHA-1: 4af5922946d5f3cac076e5dfff7ed6c129f0e308 SHA-256: ceb7f6bead75cbe2c1ea08f3158fc44545540696c8a6c206436833042e5f25a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for information. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=windows+movie+maker+for+windows+7+64+bit+free+download PDF link annotation
    • http://citygclub.com/ckupload/files/dujurilumis.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1d6293c94---9691954487.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/denozuxafaxazerawib.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/62155279203.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/71050858787.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/12542667580.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/46269922677.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/pazanukuradi.pdfIn PDF document text
    • http://llux.vn/uploads/files/gajelifamabo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/73201253303.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///2489973066.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/35768034837.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/ruzivuviwoxapeka.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/rifiwarasatupekajir.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/64405757350.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/bamixiwipuwegusasijezis.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/jedusegu.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/62677874521.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132828a1e613---75643371084.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/guputamutetugafuwer.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109041519269937.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/powuvareworurujawekopifav.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/68990645856.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/mexejulowexedokabogok.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kuludopazuxitemuved.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_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 11188 bytes
SHA-256: adbce3db533337e4c13c3b88b06b3d7b1c1759dc4292c779cd4820c3187d3e84
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 16600 bytes
SHA-256: 29e7537654adbc95376fead321e179d7dc87657454551e229baee5b2d17daa09