Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b6a77e666f94ed…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 11:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69501c1cfda3f5839cd24173adf25fe6 SHA-1: 6d653ad38cd307da62e0e5818725c9fa2c9a0ddb SHA-256: 65b6a77e666f94ed25a64deeed9b8840c8a810deb141ec2e2ef7ecf045193948
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=the+smallest+android+emulator PDF link annotation
    • http://noxsun.com/jingkelun/userfiles/files/20210928021018.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bomofezuzujagilapuluf.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/27289998915.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/67298603419.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/56858123905.pdfIn PDF document text
    • http://innersolutions-uk.com/file/redijiluxusa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144892f6d0f0---jebufegolefik.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/62804641408.pdfIn PDF document text
    • http://domario.ru/userfiles/file/44059367259.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/ginivalezefigudodafilena.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/49324654924.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/wakobofiviromubibuguvabal.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/10153010547.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/90064946499.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/welezefafefore.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/jewobi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/jigogowijelamom.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/7208072876.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/ranesomi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voporewibabemunawaru.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/gabelefoxiwedokux.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/ragetosevofoj.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109221646088615.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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 10576 bytes
SHA-256: 7a99eb0581a2fb181209004dcce596d1e9f6d62b47a6020e4f34f77705832a0d
font_02_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16380 bytes
SHA-256: c0222e812d1b8fa72de17b60ac4c9ebe990f5c2b13fb1f0a7a12992928a7f7e6

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