Malicious PDF — malware analysis report

Static analysis result for SHA-256 f384fddcbdaf276f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 23:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1387a8defa6b0f964fc67e08fc043c2e SHA-1: 954e38c9d0820b83bf67a40cae5556113c1a7ccb SHA-256: f384fddcbdaf276fcbc2ee0e748f448135f462a9ebbdedf48cb5cf2e7bd2245e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The PDF's structure and the presence of many links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cauthinh.com/luutru/files/24672262120.pdf In PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210921_21A4A37969144422.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/8083511499.pdfIn PDF document text
    • https://goodline.by/userfiles/file/32003245984.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6b2817a7---lanobare.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/winubokonawobanofedovu.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/35138652501.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/5453057490.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/46972984931.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/relibatebisimakukovijap.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/10613697381.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/lijox.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/bigobudez.pdfIn PDF document text
    • http://vecsecity.info/editor_up/50372493896.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/148a48aa95b8f5ca73d94f691b25a96e/bubunejetukaju.pdfIn PDF document text
    • http://balone.net/_upload/file///18990175818.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/gexasenofefazenub.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/25222400008.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/dutumenuzaziju.pdfIn PDF document text
    • http://capableapp.com/uploads/files/pirexigo.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zekibamewibufutegiri.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/kudedajig.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/futuzafarusa.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210918071743237323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+on+blocked+websites+on+chromebookPDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10964 bytes
SHA-256: a44a5613b6f92e069b60859b128d642b083531c85f708b185520939870996379
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 17596 bytes
SHA-256: 14023aa1f5a453be132fd07f73cedd2ab112bf6b8a48f3e046a8d5919bb1fd54
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1