Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f547d3c637038b5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 17:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8815df41c2a492f7f25efa8f11c43f8 SHA-1: f9c7681a120677584ef15f157e1da4dc3665af07 SHA-256: 9f547d3c637038b5a3a60738600b0ac267243422e9bd7a23725d7a10ebc2ef0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. The presence of numerous links on disposable hosting further supports its role as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 https://allytemp.ru/uplcv?utm_term=how+to+open+files+on+sd+card+on+android+phone PDF link annotation
    • http://massarentearchitettura.com/userfiles/files/rorerubireleraniliwebupit.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/24984529674.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/65472306.pdfIn PDF document text
    • https://ptogel1.com/contents/files/puvaz.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vasumidom.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/zazamabutusotekomoko.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/49475569856.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/98893307209.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/jufawabivawuvivanir.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xilebupufaxe.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/vagovefezetigipifitazu.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/fajomom.pdfIn PDF document text
    • https://ms1oke.com/contents/files/2317892559.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630872135B9SK.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/womekugobapub.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/10939034949.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/lexagomunexesawe.pdfIn PDF document text
    • https://buyafranchise.org/files/files/36367521386.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/difad.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/38d37e456166f3c5c444fe67132f5247.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/timixorudid.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161463ea84242b---rebobisivezibozi.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109051013044956.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_off0000afa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA7 17244 bytes
SHA-256: e245b8f4ed996a281a0a10248fb04dd08dc793416037044ac00166303fc61f51
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10796 bytes
SHA-256: bd403795ceaeeddb6acb6d32bbda0fd86f284535bf4ac2dd4c4adabe782bf067
font_02_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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