Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fbe92bbebba772…

MALICIOUS

PDF

74.9 KB Created: 2021-10-04 09:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8883fa3ac854d38ffe63102865550935 SHA-1: 8301aae302b29e0f3443d7a49945384b29bc38c7 SHA-256: 65fbe92bbebba7722296384fe3500420290f58d9e88c71c9a384739bf2da3652
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of hosting many links on disposable domains, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tssch.in/tssch/application/admin/uploads/file/47523524788.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/31798939251.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/56029677917.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/47630510994.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vapadinibuvipilazidiwo.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lurokibafepikaborubinano.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/rurenabeku.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/wefolovugexugafowurobe.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/lakivusagudof.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/sirur.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/88085919385.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/10496124422.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/rexokemiwalafu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/92581456340.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/sesejanoxidotasebivip.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/foreze.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/letewavobelewudagowiviniv.pdfIn PDF document text
    • http://ge-mak.com/files/nemevoponilivosezogatil.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/tuzupolenerinonesokusuxu.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/68429156703.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/95498967357.pdfIn PDF document text
    • http://orderkai.com/uploads/files/39880464547.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/24007020853.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615400a4cdae9---fubidifaku.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nemabixefigukalemeruti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+portrait+of+churchill+by+sutherlandPDF 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_off0000b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 11036 bytes
SHA-256: ee8e0b667c3699fbb4ab36fb60dc9b91235ecc8eb353413d19da3015ca515965
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 20012 bytes
SHA-256: 55e5238065f54ccc1ebcd20464303ac74852fdeb0889cc1f744516081c24b277
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1