Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47531e2bfd7003f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 00:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80ce642c0da7137a999b104c7e5bd04f SHA-1: b4669eaa9569b6b62262e52003c94c8d7e8d6dfe SHA-256: f47531e2bfd7003f7126894cc2abf242a2375a1f7bf4ca477a69e12949abe327
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kbcsisa.com/upload/fckeditor/file/47321713145.pdf In PDF document text
    • http://recviem.ru/img/upload/vutavagavakufujejulalubos.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/dijavefaz.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/zunosotugim.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/78656829309.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/kovixebimiti.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/memixeva.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab5507dfe---dagepakavejepivevuvovusev.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/winadixivero.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/14591316580.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/52280971315.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210920040640109.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/61382285092.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/47071560190.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/jepivaxijebiroso.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/wurapujevod.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/naxadoxenirofebexafatoxa.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/58307460965.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/risidasadijuvakipixadawa.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/27130785298.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/14103443929.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/rujuze.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/wasudig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=scream+go+hero+apkPDF 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_off0000b144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB144 18736 bytes
SHA-256: b142f86f524b337106d8ec0ff13e83c1f62a7b7cfcc857c785512fbcf34fa6fe
font_01_sfnt_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10480 bytes
SHA-256: e620bbaad55aad92b7b228874b1068673823be4e0d44f2e63873c9a08b955f10
font_02_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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