Malicious PDF — malware analysis report

Static analysis result for SHA-256 175b09ea57c71c42…

MALICIOUS

PDF

96.7 KB Created: 2021-09-13 17:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d925d83722ec6053519a7e8772eb4d4b SHA-1: 693ab8afbde43c14afc86d39af52da905a17d576 SHA-256: 175b09ea57c71c42d7e1de9bdb7744c41cb6ffba1b42468648f479789f810a06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest this PDF is part of a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ubytovani-budejovice.cz/picture/vtextu/file/4784903978.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/38004363422.pdf
    • http://lifecare4all.com/upload/files/64335818134.pdf
    • http://c2ctrading.org/cms_upload/files/gedafiziwubok.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/62176863256.pdf
    • https://uat-tunisia.com/userfiles/file/15427436551.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/vutemulelegup.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613169012066e---34165778474.pdf
    • https://dodatnagarancija.com/userfiles/file/86367049865.pdf
    • http://watdoenwevandaag.nl/upload/zisegokazedezuwirefis.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/xufunaturalodi.pdf
    • http://brain-sh.tw/upload/file/zixujuf.pdf
    • http://thietkewebsite.btccorp.vn/uploads/files/xodasamatuvilafelolegelu.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/60860156697.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/verupiresogunova.pdf
    • http://izeninfo.net/admin/upload/files/39954616190.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/wodigamovuxuv.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/57549249232.pdf
    • http://unesco-mediain.cz/fckfiles/file/kekezijaremoxajebuve.pdf
    • http://asckhn.com/acskhn/userfiles/file/52552866328.pdf
    • http://njbeihang.com/uploadfile/file///2021090222070872.pdf
    • http://vagtteam.dk/userfiles/Files/volulonex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=my+file+apk
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e4fb.bin
e203dcd6b8d5225eb3647be05e3033377d4d1c40291cbc923550bd501d5f1a56		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE4FB 16452 bytes
font_01_sfnt_off0000fbb0.bin
fa3b61acf54b817d77e146d5cd4ad841bde0bcde717471825ac967755210fd0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 9960 bytes
font_02_sfnt_off000111d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
font_03_sfnt_off000129e2.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 1820 bytes
font_04_sfnt_off00013268.bin
8474a9458a493ccf4d7fdb1617c46371426107ac08f96b58bc29f7d5a931b057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 26308 bytes

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