Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8245cbcc734d1f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 05:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc38e10f915251ac43255337acc6cce4 SHA-1: 730f13ed7bb82249891849c757820d67d10237f0 SHA-256: 9f8245cbcc734d1f1786a924bd47044b30a7c390871f47c6148d20990f30baa5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely to obscure malicious destinations or for SEO poisoning. The ML classifier also strongly indicates maliciousness.

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 http://madveras.com/ckfinder/userfiles/files/rizuzexedube.pdf In PDF document text
    • http://satcomlink.com/userData/board/file/memotupuzedaweruso.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161351e8551e59---nurotu.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/81330354777.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jilatafajoj.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/nifeveditovolumotekaxal.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210909100303.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/zexanivoxobopepofa.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/bizawiwigamujivupivewo.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/24191562171.pdfIn PDF document text
    • http://www.greenlakecruises.com/ckfinder/userfiles/files/45716507849.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/39619357726.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f136c2a8---23040439043.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/99997993652.pdfIn PDF document text
    • http://only-svet.ru/upload/files/bokalutuvegimenatajuv.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/ginoliwozuned.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/jalemozexodoko.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/46786096738.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/39790786377.pdfIn PDF document text
    • http://4bx.pl/public/file/davanalapuzafikulebur.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/mewafamunelapome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ios+fake+chat+apkPDF 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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 10276 bytes
SHA-256: 77bc686b94dfd1083ceaa5f7ef603376119f6b15fdec9f1f65cf50aa9e32b4fc
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 17520 bytes
SHA-256: b29756c96b16c15e680696b3fc92c48199d33e967324d14544028509baee4b75

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