Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b2e1e6b775d90d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 20:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aee0eb2da2b909e51eb60a0dfda5ff6 SHA-1: e4211c59a49aa057c88a296bd4c2c231a8676490 SHA-256: c5b2e1e6b775d90dbee674d3f7becd22ba47a51a28590873ba571bf9c6b00e2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm or a distribution point for further malicious content. The presence of external URIs and the overall structure point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ecoquimica.cl/dinamicos/uploads/file/13833538911.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/80279799004.pdf
    • http://cpgny.com/userfiles/files/48552418359.pdf
    • http://medtravel.pro/images/hand_uploaded/files/45681154974.pdf
    • https://dukra.sk/editor_uploads/files/64420185226.pdf
    • https://558com.vegner.com/userfiles/files/20210915_170312.pdf
    • https://loyalangkorapartment.com/userfiles/file/zaxamozikuxode.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/neziginufutuduratipe.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/64434552229.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/tarepupi.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/37898501485.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/titixilelosobogag.pdf
    • http://aliceinformaticasrl.com/user/pages/fofisewejetag.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/seximirumenitelawaronigo.pdf
    • https://toocapen.com/files/72719646698.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/89716062985.pdf
    • http://iact2001.com/userData/board/file/vepogomekowuje.pdf
    • https://whitesal.com/data/images/file/5680_20210903104709.pdf
    • https://am-system.eu/ckfinder/userfiles/files/fofegewenotoveberemiwe.pdf
    • http://gorillatheory.com/admin/upload/file/93469368065.pdf
    • http://www.fishandcosolicitors.com/uploads/files/tojubexevufatagujenof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bike+mayhem+mod+apk+download
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/53067646600.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_off0000c01b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01B 16792 bytes
font_01_sfnt_off0000d82d.bin
859a602c289dad32c35bd8f5e15e88715e3ffd67a078936eab335f33f2e8927e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16120 bytes
font_02_sfnt_off00010145.bin
5738d18e02e575662b029a5b04e3d74e4c57b0774fd68ca020a259861ecf7b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10636 bytes

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