Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef97d4cb523e37f4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 10:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 530f7848e67d321b13768d4da4b3115a SHA-1: 84e6ad6ca228e2989db04e0f313b4a414aec1726 SHA-256: ef97d4cb523e37f4ffb21d1ab848e52caf934e976e997cec2e2f3a19857a7e96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iberia-ex.com/images/blog/file/xeravugevadoxugalape.pdf In PDF document text
    • https://senesi-sklad.cz/userfiles/file/riram.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324e0b14ea1---zesuxava.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf3fd83fa---pivijefivudixumibilizo.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/91368358833.pdfIn PDF document text
    • http://timebymtm.com/upload/files/fenekuwokebijusegurivute.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/83560181046.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/64113648715.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/wavunapivuz.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/35706662986.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/komufopepez.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/noganor.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/femobozowefewe.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/xefimutemimorazoxi.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/semanesirap.pdfIn PDF document text
    • http://secoinblock.com/upload/files/bupopowadelavi.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/42967579335.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/jujaware.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/rorutigipujefojanog.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/xorovabozelijuduvexex.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/luxuzuwenedizojoniwas.pdfIn PDF document text
    • https://architektor.ru/uploads/file/gumonudujazutumonuniduz.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/sezefuzakulotonijesigog.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/13806847062.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/mufedifubefisiwijekor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pop+chat+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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 18608 bytes
SHA-256: d6477096deb72363f592653bf676f7966ce01129069492ffd51f74f7c348743d
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 10232 bytes
SHA-256: ee21f16a495368b6c036e3d4eb719755274e8b4091e1b568828b18b489c3a3eb