Malicious PDF — malware analysis report

Static analysis result for SHA-256 4353ba523d591f6b…

MALICIOUS

PDF

82.5 KB Created: 2021-10-04 22:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a65d29535cb4c6e60a9f52e5230e4c5 SHA-1: f9adfcecf50c5b34a367f9d5f43eb2e532917df4 SHA-256: 4353ba523d591f6b67c7b9084d958acdee1964873faf685f951fa86d8b6468b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple unknown URLs suggests a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ttccid.com/userfiles/files/66837774081.pdf
    • https://remini.hu/userfiles/file/25766874688.pdf
    • http://panova-art.com/files/file/runutiwoxelokugumus.pdf
    • http://cuboni.com/uploadfile/hong202109031627184490.pdf
    • https://12tiga.com/contents/files/nowulesesagimen.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/mesurevemironaziwuzi.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/88081007690.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/94937159041.pdf
    • http://tpokebar.com/uploads/files/77556444866.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210921_01D4E6017EADAE95.pdf
    • http://komputerzagrosze.pl/userfiles/file/40331901617.pdf
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/fakepujunatefule.pdf
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/lumojinegopovurizadodofi.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c6d3d81---kufimanepo.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-17/20210917171632976886.pdf
    • https://tavio.ru/files/file/34064510222.pdf
    • https://avistravel.ro/userfiles/file/gunoxa.pdf
    • http://kite-surf.sk/files/zomasozipelosetuxizo.pdf
    • http://altera.ukrstroyka.com/content/xuploadimages/file/nogigapobazizadabak.pdf
    • http://kemenyseprosiklos.hu/upload/file/87171752641.pdf
    • http://dulichtantai.com/files/uploaded/files/rodilo.pdf
    • http://soc-in.com/data/media/files/mejolaw.pdf
    • http://bptramptour.pl/files/file/siwokumivaribokitev.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/38pao4t09bo48727lbn70f6n0t/68243019827.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/tugovinimakupikoxepepug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adopt+hamster+near+me
    • 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_off0000dea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16792 bytes
font_01_sfnt_off0000f6b8.bin
823dd82ca187de43fb955f0a12b424af666dcbf05ca6c51d74e58100bfbc8068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 17876 bytes
font_02_sfnt_off0001246c.bin
551e6de84a18c307e05282ca7e5043a94aaa87290efbc6a599222c3d34c8ec7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 10500 bytes

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