Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a79a82ef4dbf25…

MALICIOUS

PDF

96.2 KB Created: 2021-09-16 13:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25deb262ea22fc2995bd6044a3731d80 SHA-1: 3a3f69fdd5a9026870b614c64676cb60974e0568 SHA-256: f0a79a82ef4dbf25b650c092f0cbf45c09b23413187f0e8efb2f13e37f2c36ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs pointing to various domains, many of which appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. The embedded JavaScript is likely used to facilitate the redirection to these malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://designsdubaiukfashion.com/userfiles/file/rivomekazazogetoxi.pdf In PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/lujuxafi.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jileto.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/33809685756.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/6680885608.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30117657032.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/reweboxegunexokovije.pdfIn PDF document text
    • https://amgaa.org/temp/files/koxujidogaroduralip.pdfIn PDF document text
    • https://xenonsvjetla.com/files/sabozusomunexizapedu.pdfIn PDF document text
    • https://il-gusto.com/images/file/jezenijafupuxijun.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/37849171263.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fujipofiwolutu.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/79118532715.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/nufufekilitetume.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/gugupobam.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/5119971374.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/72786930086.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/lezaxajisejaxuvolokom.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fesusotezutoxuzi.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/48453914414.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338344cb2f5---74280112706.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/96429387769.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/menaxumojarefebiw.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/dedemivo.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/lezirikivexinejedijevizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+visual+elements+and+linePDF 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_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 10648 bytes
SHA-256: 5746b9193c45f4542da0374fbe0cabbbdca6497a1411cb2726cf31cf03a1bf1d
font_01_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 18324 bytes
SHA-256: e015706436707dd991f5c920be416c90e5a9ad41212aa61a1b9727ac8fed4f83
font_02_sfnt_off00015aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1