Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc68509748e0193f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 12:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c04bd82e2f5ae8b7eb7a792b684d884f SHA-1: 6f34608e8e9ee15640ff5b463a7d0603072267fc SHA-256: fc68509748e0193f4598f7ecf838d04719ff820c6f9e26b9d63673f0c01d0c7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites, one of which is a known malicious URL. The presence of embedded URLs and the link farm nature strongly suggest an intent to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=the+walking+dead+season+9+yts PDF link annotation
    • http://traslochimontalto.it/userfiles/files/nodumidukododijif.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/87864248364.pdfIn PDF document text
    • https://digireg.it/upload/donuba.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2133faf64883f0cd421c0179aac6ada1/dogusosokowazosupuse.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/wejexo.pdfIn PDF document text
    • https://sadex.pl/fck/file/86070197510.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/10115395694.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/78351593401.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/pimemalemaxerunifabu.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/27415041516.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/ruvak.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/vomizuzudopapojojonejo.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/95562284690.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/91230477950.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/fugoxarosuxa.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/borixopuzutaruwezeni.pdfIn PDF document text
    • https://geloracinta.com/contents/files/644607492.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/40990650519.pdfIn PDF document text
    • http://klhl.com/userfiles/file/bisokuxasonatedore.pdfIn PDF document text
    • http://rnralpha.cz/res/file/xafawofenimubudase.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/68132357355.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://kibbkw.com/uploads/files/18105115449.pdfIn PDF document text
    • https://eniedu.com/data/file/20210921045854.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/90185740992.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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 18236 bytes
SHA-256: 836d3aca6468891c7a4ebcd58301b35a3edb02746a91af99a2106f862d728454
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 10852 bytes
SHA-256: 731dbbf5c156eb06aa44655b779508845e2c4371ad17798f03db2d6b76275473

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