Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d1a3e73e8c1ba9…

MALICIOUS

PDF

84.3 KB Created: 2021-10-17 07:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46025df14e9afbfea9009ff41c4686aa SHA-1: 294cf4a97021768f4308d81dd5abf880d6a803b6 SHA-256: 97d1a3e73e8c1ba920767d7bc6c84966301a285bb3762d423a740bcb97817bf8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a potential lure, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://vertex-decor.com/userfiles/file/segavadiwiximupewubabefug.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16166fee7b86ad---woramis.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71921304423.pdf
    • http://agcslohian.com/userfiles/file/begowerofifegod.pdf
    • http://gainliving.com/upload/editor/file/77228243749.pdf
    • http://remont-elektro.eu/archiv/file/14074372283.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/muzufilutumaxatowe.pdf
    • http://justsayhi365.com/uploads/file/14785952521.pdf
    • http://hajnysport.cz/FCK_userfiles/file/37944683165.pdf
    • http://naphogacomposite.com/upload/files/12663754526.pdf
    • http://tunesistudio.eu/userfiles/files/46348221400.pdf
    • http://formacio.fic.cat/uploads/file/mujaribisagasagifomu.pdf
    • https://ferdavagnar.is/images/fck/file/depefapudeki.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/98480470094.pdf
    • http://ambartakip.net/belgeler/file/66674537328.pdf
    • http://kccmaul.com/files/files/66974404680.pdf
    • http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/wavezuroxefudalu.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xidefejigalesegolobi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394bebc6c14---61246848756.pdf
    • http://divapharma.com/uploaded/file/78137174933.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/71159472618.pdf
    • https://cemb.ca/upload/editor/file/35354714100.pdf
    • https://mysmartedu.com/uploadimages/files/mopado.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/jugaloponakinozeketitabe.pdf
    • http://vitacanes.com/uploads/files/xusoledogag.pdf
    • https://asi-filter.pl/files/file/rogamakelifabusolegegixe.pdf
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/xobawifidolaxerevanulil.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=tomans+to+gbp
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 16792 bytes
font_01_sfnt_off0000e8e7.bin
90be526714818eabc607f546e4d7bf389b36598b5b8d919f52ce0a3256dc8b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17352 bytes
font_02_sfnt_off0001156a.bin
2a3f1b5aa5a980dd371136eb5d6605dd4aaa0e604675b09fc523ca74d1b97d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 16344 bytes
font_03_sfnt_off00012be6.bin
94b516006fd9476211ed2bd8ba36bb07cb6ad4852d3c50827ae70b92260650fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 10328 bytes

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