Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f608c48191f8fe…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 16:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cdd88b9188768c006fec93f3007d105 SHA-1: 07c0fd676d1dd1b19824f049d6d09e10d4912597 SHA-256: 28f608c48191f8fee05771ed55075337358ca516cdf55975d6bfe24d6364777c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=watch+free+movies+and+tv+shows+apk
    • http://adhunikjewellers.com/ckfinder/userfiles/files/vazivudadejikulezatumifir.pdf
    • http://qdsenfeng.com/data/files/palusogewuwubekefugodi.pdf
    • http://studioambienteterritorio.it/userfiles/files/33703964873.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/43090129115.pdf
    • http://orthopediedelft.eu/files/4097593259.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/60121233630.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/37301618135.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/fosagogewugejapaju.pdf
    • http://oldadmin.k12cart.com/media/files/bisifatigawu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130299991c2e---motugajagasimatupujo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/39ecfd381823cf1adf3d1665972086f4/66403941370.pdf
    • https://worldmedglobal.com/userfiles/files/50012229635.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/fupamigide.pdf
    • http://tw-echen.com/uploads/files/202109120549173088.pdf
    • https://pesonabali.dswip.com/ci/userfiles/files/27794375903.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/33168679078.pdf
    • https://marblo.com/app/webroot/img/files/vetadopimogidanezubejuja.pdf
    • http://secohthailand.com/file_media/file_image/file/bubure.pdf
    • http://cristalparkhotel.com.ve/ckfinder/userfiles/files/zexovapimaduzofowofa.pdf
    • https://hobbes-group.com/upload/files/jepejipaxoboj.pdf
    • http://rent-lease-no1.com/userfiles/file/20210903163037.pdf
    • https://mi-stores.com/basketballtotaal/images/editor/file/29546350860.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/60880068927.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b448.bin
0ccd66a43d81d3addd12d3e485e6a39eec953b7f48d56db1618a5dcd37405615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 11076 bytes
font_01_sfnt_off0000ce08.bin
a89432d50bdf095270a133aeb14a4716ae053104d7c362811e0738d6debbe0b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 16032 bytes
font_02_sfnt_off0000f769.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.