Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff34028fa765f9d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 10:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 240a0d09c84975759997738cf88043bf SHA-1: f5cbafc6073e7810be562f60eefbef0a448df779 SHA-256: 3ff34028fa765f9d13e4312116b446ee32dfab04e3de8983b32de15089ad14a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm of 25 distinct domains, many of which are disposable, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hocomesun.com/upload/vaxibepog.pdf
    • https://karolinanowak.com/userfiles/file/tisenekexino.pdf
    • http://v-lukomorie.com/uploader/files/78782071293.pdf
    • http://rsti.biz/files/fck/file/vuvululuj.pdf
    • http://vipdiler.ru/files/file/10139643086.pdf
    • http://hijoin.hu/editor_up/12482220472.pdf
    • http://wx-test.com/upload/ckimg/files/202109100825489711.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/nawakifebonu.pdf
    • http://duef.ru/public/file/kosiwevad.pdf
    • https://0286869143.com/editor_images/files/feserogigefumexobu.pdf
    • http://mtecommerce.it/public/news/file/digoxiromikenefev.pdf
    • http://eiffelflowersquesnel.com/userfiles/file/93273094654.pdf
    • http://kgmda.com/upload/files/14621629782.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16142796874e53---81500638799.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/90933227886.pdf
    • https://it-remarketing.pl/app/webroot/media/files/wifurulasegodusez.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/81119883779.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/13682241792.pdf
    • https://clubelsendero.com/img_pag/file/39885749841.pdf
    • https://fajndoktor.cz/images/file/files/79311020378.pdf
    • http://tavio.su/files/file/kezinebuto.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/naxazapixoli.pdf
    • http://sukhonthip.com/file_media/file_image/file/37193994187.pdf
    • https://tramhuonghanoi.vn/upload/files/76290058518.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/84859487595.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+tv+6.0+firmware+download
    • 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_off0000c266.bin
7f199957b3e7c94fa1eafbe6f42e76438cefd816e4550f23474ae30df1083255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 16868 bytes
font_01_sfnt_off0000edb2.bin
ce25bef872364e9c0f76dd7a121530a92238bac18c9275259c72ec401feffc84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10836 bytes
font_02_sfnt_off000106c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 16792 bytes

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