Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c91708fbd14ac5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 09:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe1c0cfcf1a182473b5a296c9d43054d SHA-1: 2cb843a503647e8a6660f087c749c46a71ee53e6 SHA-256: 95c91708fbd14ac586b2228da45e30a488548302d53780ef3e464081f881a3f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF likely redirects to a large number of distinct hosts, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://houtackers.nl/userfiles/file/zixopazipek.pdf In PDF document text
    • http://seteo-dechets.com/images/file/kapumikavotizoxebudogu.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/xudovizoj.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/newirifike.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/38152045711.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/36744821579.pdfIn PDF document text
    • http://bresky.cz/res/file/kawimobazadotonumokuz.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/guzitaxu.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/kigixevovidimiri.pdfIn PDF document text
    • http://showdoimovel.com/files/files/namiwamapi.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/56456032855.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95643bd84d583a4e3aff21081b3884d9/20045680664.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161515d8821652---4210560869.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/fuvegiwu.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/morajenomo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75695393183.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zupav.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/89058588203.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/92045533296.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/37589493057.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/90058676716.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/woraxuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aplikasi+penguat+signal+androidPDF 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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 10740 bytes
SHA-256: 37b4ac5d73ed14a2d8b06dc5ff4940dd9806ebeecc92bf9a0a011e0d997781cf
font_01_sfnt_off0000ca53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA53 18456 bytes
SHA-256: 69b663e1174ce1759c2e380a185eb092808da6ffdde2a35f3621a24579301606
font_02_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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