Malicious PDF — malware analysis report

Static analysis result for SHA-256 377bcde32dcaa812…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 04:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c442ad9016f93a4842f1dd0cac1ca0b SHA-1: 52fec59612cb8122fe729265c0bf9670961fa742 SHA-256: 377bcde32dcaa81234e4de25b0133cdd6b97827340a0968a7d6a9e077a8f1d1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm, pointing to numerous disposable domains, suggesting an attempt to obscure the ultimate destination or distribute various payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tichdiem.surecare.vn/uploads/userfiles/file/75482643584.pdf In PDF document text
    • http://rcp-ranstadt.us/files/taluzo.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lemuwedisikibinuwisuwagib.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/lapusonavexo.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/59783755818.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xasowuze.pdfIn PDF document text
    • https://windsbs.biz/files/file/ranofupebelora.pdfIn PDF document text
    • https://equalland.com/uploads/File/236100888.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/96942011780.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614012a209a79---tufurefimevobike.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/dawupisosudulujagixesozu.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/74925658292.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/zeduladovamoxumifibas.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3eb77e90---wotesiteruzunezatunes.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/dofisinagupalajebasowuba.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/43996005206.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/nozagu.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/pusukemodakejigujoso.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/jefopolebokometir.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/16076473109.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/jigewifiwesawepot.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/ronusomuzefikefidixiw.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pesafediwej.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/97410334792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+red+letter+day+meaningPDF 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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 19564 bytes
SHA-256: 88961abd434e9e4297b7c2d0730836a9a21e536d9eefdbe99a756f73b7f440dc
font_01_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 10400 bytes
SHA-256: e1fe7b1583bc0067124636e39252ffa48bc11bc327aa813194b9414564c6ecfa
font_02_sfnt_off00013437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1