Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2d3733eec20b84…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 19:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62bac2b6735006ee4cfcf76e6a1dc30a SHA-1: f9a0c712456b26954d2270ad4763d6b8188fc3c4 SHA-256: 7e2d3733eec20b84800075abdb0bbd33a02fc47505ba37fd7daaef14357912bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure points towards a phishing or SEO manipulation attack, likely involving the distribution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://szemvidito.hu/sfwkr/feltoltesek/Images/Image/rivakawasi.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/180320121812.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614e71026a385---rimid.pdf
    • http://sameiroeventos.pt/ficheiros/fokelabogepovutox.pdf
    • http://kaies.cn/upfiles/file/16693803206.pdf
    • http://cellesekorea.com/ckupload/files/96172744895.pdf
    • https://west-holding.com/userfiles/file/78463646385.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/tatuvaji.pdf
    • http://www.cafeinca.com/img/public/contenido/file/24619770538.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/15381881274.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/fojetetefo.pdf
    • http://ashioke.com/images/library/File/kigogamuxovukava.pdf
    • http://makinsushi.com/uploads/files/rabavakiloxosovanol.pdf
    • https://thefertilizergranulators.com/d/files/4278128177.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/68311314152.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/xiziwofi.pdf
    • http://mottaing.eu/userfiles/files/jakixexufivejikidi.pdf
    • https://cyc-catering.pe/disac/userfiles/file/86113175730.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jailbroken+firestick+apps+for+movies
    • 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_off0000b3c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 16792 bytes
font_01_sfnt_off0000cbdf.bin
c89f572dfc3c4a37f6e548512a0b830d080c997acb17b7654bbcd7dc1d382d9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 10928 bytes
font_02_sfnt_off0000e4fe.bin
81a3889fc1a24d24d0f26176d90b14b3d07a8d068374679fee17a8ff2be903e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 18824 bytes

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