Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb99b904f7ecfbf…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 04:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c10918cc9292f5f5cc4204f5ddfc8b6 SHA-1: 95320db0aa54a1c143e0c86cee6cccee0fcfec7a SHA-256: 4eb99b904f7ecfbf638eb8c5258587f0492a2fbecec4452ce7bd7f830c28f1fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true malicious intent. The embedded JavaScript is likely responsible for initiating the malicious activity, such as downloading a second-stage payload or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://royal-pizza.eu/files/file/nufov.pdf
    • http://gzsjlt.cn/userfiles/file/lesukofemadipoxokuraleli.pdf
    • http://alexdisinfestazioni.com/userfiles/files/63670443732.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/jutedeg.pdf
    • http://massintech.ru/img/outer/files/mudatoxuwawapememavuw.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/nutoso.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/85740010159.pdf
    • http://prestopc.it/upload/file/30681191790.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/buxaposebalokejolokig.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/24345655714.pdf
    • http://skonasystems.com/userfiles/file/15924128909.pdf
    • https://papiratisk.cz/soubory/winowe.pdf
    • http://vitalchurchesinstitute.com/files/file/wunafetodafev.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifopegekadiv.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/27122701267.pdf
    • http://electronicaindex.nl/images/uploads/72980484466.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/39441343081.pdf
    • http://sasolution.kr/userfiles/file/tijegisat.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/73862824815.pdf
    • http://gdgom.com/upload/file/210902110631610849m8b77zxdchej.pdf
    • https://marupyara.com/fotos/userfiles/file/43066447829.pdf
    • http://leeclinic.kr/userData/board/file/3702810235.pdf
    • https://fontaine-eva.fr/userfiles/files/xivowovizu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=make+background+transparent+android+studio
    • 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_off0000df5a.bin
b9b01559540b7af681802ebb6ee7b3d7efd3f601ead523a2da372b5441a59372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 19220 bytes
font_01_sfnt_off000112c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 16792 bytes
font_02_sfnt_off00012ae0.bin
f7a351cb913c2c72e124e2827b715dcddc7e86bb5095444fc53101fa040b96b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 10968 bytes

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