Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee371983c0b43a0…

MALICIOUS

PDF

81.5 KB Created: 2021-10-18 21:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5845b478b6b1bf98f70c0a7b83a346b5 SHA-1: 718290f0e255f8455fa5a543168e9a774d04b11e SHA-256: 9ee371983c0b43a0eea61f81fb18bb0de7c17e1b2b66de48208477d0c69f1e72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing activity. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm hosted on potentially disposable domains, designed to obscure the true destination. The embedded URLs, while numerous, point to a collection of PDFs hosted on various domains, reinforcing the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pngroup.pl/ckfinder/userfiles/files/89841750102.pdf In PDF document text
    • http://ncteonline.com/userfiles/file/49488783018.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/sanukawagagedixuder.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/51563121151.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/25585158446.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/63569710113.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/67354804318.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/jozipumivuzalaxotezib.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/lopikalulosobidemuba.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/22332555095.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/42143873572.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/dizewezepe.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/47559784351.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109180256337402.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d6038f9b---dafimokefigu.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/zelulivulevalonu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/2089459035.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/22373556956.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/jovijuxinow.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/49503651537.pdfIn PDF document text
    • https://el-tall.pl/pics/file/23019043426.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/67735318619.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/7301442869.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/tumodotoxakigogevefuso.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/77967554191.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=this+is+out+of+orderPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 17696 bytes
SHA-256: 0e3d5a5efafb8308491b4f08a29e27ea0bfd651acfca3fb632590cb9bfc63b8e
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 10200 bytes
SHA-256: 5748b803add804fc4344ec0f983fd6aefc967500f23e5bbd9a8e24216194aeb5