Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfd68a4194f7233…

MALICIOUS

PDF

83.4 KB Created: 2021-09-24 08:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e91fc2319d03db1a05799b75bdbdf5d SHA-1: b69a1361a349c9bbdfa74faff70511cda6a9cf82 SHA-256: ecfd68a4194f7233860031214e8b08196dcd3d997d6e5def28b91b20e5631231
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://karolinanowak.com/userfiles/file/xabejejarimu.pdf In PDF document text
    • http://seasplendorpetro.com/userfiles/19295624788.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/73485703392.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/56041047389.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/tidofa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/38636151088.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/31821391799.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/kogun.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/57018208689.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/litafawalirobudowowalemut.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xugifozopajozat.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/jififopodorusijitol.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/wenotagoma.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132e12f2ba40---jitateleminevafopomesowe.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/16610980421.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/46674106664.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/gosategejepufowemuvuwugib.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jivapala.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/43568158413.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/polowipam.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/tevobobemitijas.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/36830888844.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/gawumozi.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xulabupikujelareker.pdfIn PDF document text
    • http://evola.it/userfiles/files/20611041448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cricket+live+match+streaming+appPDF 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_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10892 bytes
SHA-256: f894b70439ee8546fff92078e6971b58310894829f566182892d58b026b7cfbc
font_02_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 17476 bytes
SHA-256: cce7c15eb42684bf47849dcb726e86457f197b7d249a34aa7ee3a7c9aec23e3a