Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd682a07aaa71f…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10563e2c936e5b884c949d9eddf7c8f9 SHA-1: a4423faeda250a9cb9fed0da3ca6b228fe4fc1db SHA-256: bfbd682a07aaa71f722ba6d2c1215e75bd68b4a333b6b239980a736cfb4be5f3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-only content and embedded action trigger, a common tactic to trick users into clicking malicious links. The document contains numerous URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://fanti-fitness.pl/uploads/assets/file/99465391038.pdf In PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/62853085781.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/91232446091.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/86672317606.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109091946464554.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sugofevuwuvixonuzenikofi.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/puvufumutufidok.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/83376540789.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/81438936628.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337a6c4b032---24459556290.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/a37df5cceae1c31574a48692017ca7ad.pdfIn PDF document text
    • https://techlan.pl/files/file/89013772937.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/44212808357.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/fuxuguserepik.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/fenogez.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/mugurimowatotow.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/givowejubidoko.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092607081340.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/gozotofodexe.pdfIn PDF document text
    • https://harom.ro/files/file/55003189264.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/mumegafi.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/bawezumojifot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=game+hacking+apps+download+for+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_off0000ab99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB99 14176 bytes
SHA-256: b695c1218218e6b7935c2b152591d1d12f039b8711a7233f57b4700caecfa83f
font_01_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 11188 bytes
SHA-256: a965dd1858d34d72a4d08d6d4ac0e2591105ce53b476cacb3702b243208a0c93