Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30270946e0562e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 06:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21c09edc41743ae3e93c569261900784 SHA-1: d840eaeb6396d95a7f09acd217f78a4e3850ef8a SHA-256: 8e30270946e0562ef17c2f98f59e39983bfdd98ba2a341ff450fb3814f322223
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, with one pointing to a link farm on a disposable domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://piotrkowska77.pl/zdjeciafile/lobamosexineg.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b98435ab06a974f61b9548d3e6bb84f4/17627860765.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/22631213974.pdfIn PDF document text
    • https://kulittelor.com/contents/files/22150126526.pdfIn PDF document text
    • http://handgun.ee/media/file/71465610727.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/bewazurizopobetevow.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/10477296296.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/vunamosamapopetiropozoxuw.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/jajufalosa.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/nuxisuna.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/jipibokoxirut.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/54470330428.pdfIn PDF document text
    • https://coluer.ir/documents/file/21645209684.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/potapegaparudisavagip.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481d080d941---demazumogikosanulonolen.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/wabomibuvilosezokipuxale.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/17789055529.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/befalaxitala.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/gulaxudediziripegesenane.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/defesuvukawesegeg.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92470321369.pdfIn PDF document text
    • http://stylekd.ru/files/50211660852.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/44121763960.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jijusaripufewedut.pdfIn PDF document text
    • http://djpress.pl/Image/files/75717619392.pdfIn PDF document text
    • https://southafricapools.com/contents/files/53132231628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spongebob+game+mod+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_off0000b4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 10536 bytes
SHA-256: fdac243e90f57c47cc0f41717230244b21029e450a7f74f70f8c92531741c538
font_02_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 15732 bytes
SHA-256: 14e02b0d315dbc2e9f6335c9dd8bd5851a6a56a9ce088f759658f495ddc6e8e1