Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b76a9710e96764…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddc9eec7375864b0ab83e2234b14f4ab SHA-1: 6bded7bba6e82eef4f17df1d450ff53d7c9cbe2e SHA-256: a6b76a9710e96764827c60b367f9b4a7072f646897e53d74590d73d975c98804
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm with a high number of external URIs pointing to various domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate malicious intent, likely to lure users to malicious sites.

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://catamma.ru/uplcv?utm_term=sdk+version+29
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/96010251433.pdf
    • https://garnet-medical.com/userfiles/files/66490171009.pdf
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/sipad.pdf
    • http://pobierzplik.pl/uploads/files/junivunukoba.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/8525224336.pdf
    • http://tindangnhadat.vn/upload/files/93958431209.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/34489277668.pdf
    • https://hyosungulf.com/uploads/file/89049788129.pdf
    • http://hejia-ele.net/upload/sebokava.pdf
    • https://clinicscrm.com/img/files/wewujapetasojisot.pdf
    • https://granitnet.hu/editor_up/29949702148.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/xetimiwavusivobinofilodid.pdf
    • https://98ing.com/upload/ck/files/20210916_032608.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb015f2a2---wubawefanap.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/61007008114.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/97372119035.pdf
    • http://020tzs.com/baige/images/userfiles/file/35625248733.pdf
    • http://mofrantech.com/userfiles/file/40939162769.pdf
    • https://tuinvandecruys.be/file/zapemutixorefosali.pdf
    • http://diadiemvui.com/upload/files/14997728511.pdf
    • https://winstar-tools.com/UserFiles/editor/file/vexurugujukewasusudesumax.pdf
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/80096311643.pdf
    • http://sieuthimaynhapkhau.com/upload/files/kadilomifipinuwizazi.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_off0000b04c.bin
ea75522d7104db771b647f8a775fcfba3da8da2f7c66d95a2b5199935dd79e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04C 18348 bytes
font_01_sfnt_off0000dfb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 16792 bytes
font_02_sfnt_off0000f7ca.bin
18c282e7073ffce2b7eaea9963700ba5fa7ff8916d0d00c025dcecc307d31763		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10456 bytes

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