Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cdea05ee2572a3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 08:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f8a3a703a785e8ae0ffe6c3571765557 SHA-1: 0224559b13027abaf4c3fa5c2fab5b15305047ae SHA-256: f1cdea05ee2572a37db1203f18e9a98c1ad3edbd3181efc336bd86f023164291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/31759319942.pdf In PDF document text
    • http://sintjorisparochie.nl/userfiles/file/77120367308.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/gagakunezabavatatufujaroz.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/kofasevavuzuturota.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/vukovopuwubi.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevogejowoxinu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/47342606856.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00e686850---guzupejemelob.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/5182655687.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/32617022565.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/28112099446.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/66916794978.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/40889529241.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/jadodurunijuvivisi.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/metedubelorusexuto.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/biludofexapabusuja.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/kifidibaj.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/42369062506.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/nomoliwijugifoviwiwebolo.pdfIn PDF document text
    • http://klenderbio.com/upload/files/kixem.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/35560100747.pdfIn PDF document text
    • https://nls.vn/upload/files/65668158715.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/bolujukebazoz.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/fewak.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/48126442843.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8786c72a197a3e430c30514917b33883/97425107411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gta+online+money+glitch+xboxPDF 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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10804 bytes
SHA-256: 4dc0561ea1460dc90225f74e5464c71ff73dd7c55cabcf10bfad7c09b1a0e742
font_02_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 16584 bytes
SHA-256: 08c8e57a068113d0821d7a7fcc27411642b9269f2bc17654d500c5e3ca204037