Malicious PDF — malware analysis report

Static analysis result for SHA-256 e161d7be7940b629…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 016df572489c2d67217f95a9b5b8069b SHA-1: 5cc57ffa5f546c80786dec51e8468a577cede1b0 SHA-256: e161d7be7940b629d0b54f4f92f290dea992996ee46f1a7ef0423cacb76e209f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=android+theme+for+windows+10 PDF link annotation
    • http://hyundaihungthinh.com/uploads/images/files/65709998534.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/74300961784.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/51476509718.pdfIn PDF document text
    • http://salkim.com/userfiles/file/16212832650.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/70255855179.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zirazelavex.pdfIn PDF document text
    • http://julianina.de/upload/file/3585145926.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161401709ec79e---57055579575.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/guvubixorelepuzunud.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161302c982d6ab---90494096565.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/8204898379.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/nixomagofe.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/podegawiwisimawutil.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/nixikotodupekobir.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/fifugefirarirozukup.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/gararinawufelewewuki.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109091615135911.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/rutonogepuvulixudugezafaj.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/11123316603.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/podivonur.pdfIn PDF document text
    • https://krossi.ru/images/content/files/lutamagor.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/vejatew.pdfIn PDF document text
    • 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 18080 bytes
SHA-256: 0003603b88e06aca5a1d16f0fcf08e3c2e02947b6d1950a8b6f2255fd5c51f5e
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 10652 bytes
SHA-256: 4a43b0d93bf5a56e9233e415ab0b1a2304aac1c9bf501c3ba8101089eef18b93

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