Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1457552d5ce262…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 14:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7abd8a3c3edcafdb3b17ed9c226311a SHA-1: 2e6dab3dce808be1acfac9cb3623c36002ba3258 SHA-256: ee1457552d5ce2625f33e1a51d7e22c931ea8b8bc050d1f499c834a6f224e0d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=download+black+panther+2+movie
    • https://chasehr.in/userfiles/file/56129292703.pdf
    • http://msslink.ru/userfiles/files/godiduseser.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/lunavomovo.pdf
    • http://leprofit.ee/cmsfile/contentfiles/28593035086.pdf
    • http://slmj8.com/data/userfiles/files/64342854708.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ad1df08f---28351736412.pdf
    • http://szm.hu/userfiles/file/94482319446.pdf
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/zuwerisoromudinimeruw.pdf
    • http://dayou.tw/uploadpic/files/202109050442575718.pdf
    • https://vinacomvietnam.vn/uploads/news_file/34364419628.pdf
    • http://wsystem.sk/userfiles/files/52256582463.pdf
    • https://zoldlaptop.hu/ckfinder/userfiles/files/39466751945.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f798751e12---gexawe.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210901_0BA12E3D225AEDAA.pdf
    • http://rem-stroymont.ru/img/file/95548812486.pdf
    • http://qkmedica.com/uploads/userfiles/file/jobasedenivezapo.pdf
    • http://okvin.org/userfiles/file/95246621069.pdf
    • https://recapress.com/ckfinder/userfiles/files/99345617540.pdf
    • https://kirmatas.com/userfiles/file/68066653220.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/25652002053.pdf
    • http://jatyn.cn/upfiles/202109/file/1631596509.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/94664247378.pdf
    • http://drironcat.com/images/file/momuzejidiseramasadafode.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/341313873.pdf
    • https://mauspro.net/upload/files/powonovijafekotujeneb.pdf
    • 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_off0000e39e.bin
5d7ea0696918b971f541f93e82dca448675d5fd29c6607f5a681bdcc1733319b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 17220 bytes
font_01_sfnt_off00011072.bin
c8a47959a7273e82966aa89d4ce84deeaf3360ab25d761f82da24005ddb6adda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 11116 bytes
font_02_sfnt_off00012a0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 16792 bytes

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