Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c65c7f2b54e6182…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 21:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b824c13fe511d0cc26251de12e21652c SHA-1: af4335a7b9b71dea516530700746386b5c07d29d SHA-256: 0c65c7f2b54e6182018ec3aa74d07e812efe5b7061363aba91fc142b4fe3c15b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://1877painters.com/FCKeditor/file/bemuvigaloturuti.pdf
    • https://learn-atdi.com/uploads/files/98224864110.pdf
    • http://nemochem.cn/upload/files/86517352992.pdf
    • https://odlingfamily.com/userfiles/file/besabokajapizadaligobu.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/79719058821.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wafixerolon.pdf
    • http://truhlarstvisollner.cz/data/file/wazido.pdf
    • http://moneymaker-gold.de/files/21917938591.pdf
    • http://hkxhjfc.ltd/uploads/files/20210912163220.pdf
    • https://optical-axis.com/uploads/files/202109042329277106.pdf
    • http://egitara.com/upfiles/files/16837202867.pdf
    • http://verzorgingsindex.nl/images/uploads/detakulajixokovidawi.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/wepuwilutajil.pdf
    • https://marsanz.pl/uploads/fck/file/96612163935.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/63396489017.pdf
    • https://aramlasmerok.hu/uploads/file/farofagirumugubewu.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa415ecf0---71648020698.pdf
    • https://limberhurstgallery.com/imageuploads/file/takebewe.pdf
    • http://www.darvidproperty.com/news/file/59991731588.pdf
    • http://mariondhuique-mayer.com/data/file/zazusapavuzi.pdf
    • http://nguyenphat.com/public/default/ckeditor/files/suputodipudajagegevin.pdf
    • http://avtokapriz42.ru/userfiles/file/32037286337.pdf
    • http://vuatoyen.com/uploads/userfiles/file/puvituriwa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=spider+man+3+full+movie+english
    • 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_off0000f0fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes
font_01_sfnt_off00010914.bin
240ad9ff7304aa955682757dd1eee54acb1248a0a5c9c60935f5ad5d41b54bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 11260 bytes
font_02_sfnt_off0001230a.bin
04c11c7abcad30b2ebe552e6e2e89cc1cf39f50c17410c5c9d93fe82c17366ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 19052 bytes

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