Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8be33bd9dbf1e6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 13:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9463ecb89f1836014adeff487529fbae SHA-1: e80ee8f9e073d6961d64124e696023f16f7d3bca SHA-256: 7f8be33bd9dbf1e6cab62d80c2ca57c31d7167b27e48e2b756258a69a9204b82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The numerous unknown URLs suggest a link farm designed to host or redirect to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://jamisonfurnace.ca/userfiles/files/87295137068.pdf In PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/gisexesapifuboxojimewiw.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/13906787272.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/13113804552.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wefilirabelogadu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/watubu.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xexisujadalafug.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_230926.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bosagido.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/bagadapufeta.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/81433801234.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/tojikakalebirebiwot.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/pisos.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/9892414813.pdfIn PDF document text
    • http://tzsunup.com/upload/40250477835.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/nasutagipogedafuki.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jatimenekitelirajiki.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/60820331174.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d801a28f66e67f01f77ea6295e71e33c/zodorisofe.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/77522274845.pdfIn PDF document text
    • http://vucert.vn/uploads/files/94208324118.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/sufaxajexakanu.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/dijimomutejebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=text+messages+going+to+old+iphone+instead+of+androidPDF 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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 11008 bytes
SHA-256: bfde599e9903ad9428c27e28475b03d4d13002641c4fe65681f5dd3863d977b3
font_02_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 17160 bytes
SHA-256: 04a50def487f93f9f6396814936b28b5f8249d8d604878187b6ec9d8a9befe10

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