Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca36137ceceeae9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 09:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f74d54228b27743be6374ebedb7277b SHA-1: 3e81d27dc72260443ca0b4c957835f9e7336efd3 SHA-256: 5ca36137ceceeae966c916d6f2046be0002d1db7511eeb01ce6cb5b1e9ee278c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document is designed to trick users into changing payment details or accessing fraudulent banking information. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack. The presence of numerous unknown URLs further supports this, as they likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://alansglobalservices.com/ckfinder/userfiles/files/15367078104.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/dopadoji.pdf
    • http://fuerst-architects.com/uploads/file/94980236963.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/4f76206c86c1cd6a34512c27210cb729/62735637347.pdf
    • http://sns-russia.ru/userfiles/file/33002847814.pdf
    • http://vistobrasil.net/uploads/file/lusaniwivojemexamu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4e21c2db673d4bc1dfd88d417e564eca/5946769700.pdf
    • http://ciaomamma.hu/editor_up/37930202801.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/93679806175.pdf
    • http://hyunshin.net/userfiles/file/pumolutekud.pdf
    • https://saigonservices.vn/images/uploads/files/dutifegugebi.pdf
    • https://casabresciani.it/uploads/file/40988264216.pdf
    • http://mmbc.cz/_data/user_files/file/lekenufoxepafixonorub.pdf
    • http://gysanya.com/upload/file/210902173736155517dd5o6cxd4pze.pdf
    • https://vinamex.info/uploads/news_file/15204547715.pdf
    • https://wildnaturetravel.com/File/64346094235.pdf
    • http://erpos.sk/data/files/58084141183.pdf
    • http://crosswaysrecruitment.com/userfiles/file/kewuziworotabukinisog.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/9391182281.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/83026390319.pdf
    • http://dreesmann-foto.de/userfiles/file/2131049783.pdf
    • https://sanagustin.cl/files/savefenimiwusajak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+12+import+contacts+from+android
    • 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_off0000d87f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
font_01_sfnt_off0000f096.bin
9f41fcc222305ec4676dd09c1f364d545853519ab5df6f2fa801431ed4620773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 10960 bytes
font_02_sfnt_off000109e8.bin
64e2731b9dfa9a6111a5b749577d2cb35c15c4d380ece700ee886f3855ffbdf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 17756 bytes

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