Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ae0aab780166dc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 18:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72476ed184deef1477999549c6c491a4 SHA-1: 7b023d03eee9cd3e4185005bb435264ad0738998 SHA-256: 96ae0aab780166dc2d5dab447d6ec3bb1c6854b5a2a90f940de36d77878e868f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL distribution suggest a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=s20fe+display+size PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4c09be60563e592f3dec84e8b2dafde5/pufugozakibikexuxuwak.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/9958669648.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/93259319071.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f083e311b6---jefososuzex.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/2928521138.pdfIn PDF document text
    • https://producto.works/userfiles/file/foginajoledur.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/83618554109.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/mederejiguvafavole.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/xuwinalulil.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/46985384209.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/ginosodikizex.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/9385368413.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/22530179387.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/54244660892.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/81328872712.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dasizosulugulonij.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/robaxanowilenel.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibibagunuluzutumegaluwaj.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fadufunitale.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/rarojopaxawogawusorot.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/lodelixe.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/72543028387.pdfIn PDF document text
    • 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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 19044 bytes
SHA-256: 9a014a276fde429e98772e8dec8ffe943102a728d78516e6721e952c541cd23f
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10560 bytes
SHA-256: 6488eb3aae7f616ce766e1c2b65e4fb73a46dd84298d9b4a4eb909f07bd04015