Malicious PDF — malware analysis report

Static analysis result for SHA-256 90501960f7905756…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 22:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: faec27c01814211973d31e67f9737723 SHA-1: d8d68c64dc9ddb86c31fc26745d9de3db7e3a828 SHA-256: 90501960f79057564aeeef01872ad505963be3ccfb81a8b839977aa681aba43a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://nagakuratrading.com/js/upload/files/meduveg.pdf In PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wibesaxozebukule.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/pidomopetotuxip.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/badoba.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_19CBC390640B4BDD.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/jukorewosilosenakagi.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/seletubavorexofefoguru.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25164513914.pdfIn PDF document text
    • http://sushi-belovo.ru/files/dolofut.pdfIn PDF document text
    • http://unibox.lv/files/text/jepuno.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2cd1d67f59d2485e6829784274ef5f30/bipawedelanosaji.pdfIn PDF document text
    • http://na3.it/misc/file/sokejisugifikojelubenubuw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135131650302---61833528308.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109010855265611.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/radibasumavebolopobisek.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/zinunubiburerovafukuseg.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vebopekimutam.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/povokuwevapuvukenutu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62369989637.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/janowizaforij.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109081930397030.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/zajifatipasejabejirasa.pdfIn PDF document text
    • https://maria-galland.ru/files/file/79818794223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=giant+steps+tony+robbins+free+pdfPDF 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_off0000bb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB05 16868 bytes
SHA-256: 45cb57f1ba1b4bfafb49648f58f6fd788438f9f8f8049f4e5d84f81777eced46
font_01_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 10740 bytes
SHA-256: 8f7cfe2f125694d7bf7a28e11c155a89b4da528ff00b963db9f88ab7951e122a
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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