Malicious PDF — malware analysis report

Static analysis result for SHA-256 e395b3b31ad31814…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 10:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39f94848b85920f9ca4e5aefa50fc34e SHA-1: dc6243a280bc876a30af7f3e27badde9ade3e2f6 SHA-256: e395b3b31ad3181454bdf6113466d9c6a25b3c228dc102de52c68c856504a5cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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://pixomot.ru/uplcv?utm_term=facebook+messenger+send+pdf
    • https://samsungdvm.net/upload/ckfinder/files/91404567968.pdf
    • http://hydrogears.com/survey/userfiles/files/9124620888.pdf
    • https://restaurant-kamkok.fr/img/Data/file/43477144033.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4e0b01eca.pdf
    • http://idcla.net/upload/files/buwatupiposorigurubi.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/n0f4aq96bk4vahla720fm5b5k0/voladamipazuxajeredom.pdf
    • http://dobre-jaja.com/Upload/file/61027881994.pdf
    • https://ms1oke.com/contents/files/xukedirosidufuxamovuj.pdf
    • http://hiro-seiko.com/upload/files/54872991315.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/78180743366.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210923_102555_115.pdf
    • https://essaidafm.com/uploads/FCK_files/file/difomesewamumofotowo.pdf
    • https://www.sudicobank.com/ckfinder/userfiles/files/tafanitesazupukokug.pdf
    • http://flywings.sk/UserFiles/file/72460399916.pdf
    • https://dadrarad.ro/userfiles/file/99213748720.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/70792497428.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/warigogamovetupikimiwaru.pdf
    • http://op-gold.com/ck_image/files/58635433212.pdf
    • https://eltechma.com/zdjecia/fck/file/xumatewafubikuwu.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1631977538224.pdf
    • http://win-sonic.com/ck_imgs/files/60770078249.pdf
    • https://blugarden.eu/file/miwasepenasavofiginilin.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/83030918021.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_off0000b1ed.bin
fa0d1de0bcc7895eee63901f051fe6d3f0726cdc1233863857ea220f1aa3aa23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1ED 15380 bytes
font_01_sfnt_off0000d90a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 16792 bytes
font_02_sfnt_off0000f121.bin
233dd8600ad080db454434825c0a94ff2e23b6d55c0fe298df98312ce92bf4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 10936 bytes

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