Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3be76f5bec4d7d4…

MALICIOUS

PDF

91.5 KB Created: 2021-09-24 02:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54796ed9e3916acb740b5014dea63695 SHA-1: 65e512af5e1196763d14e1ebc1b2bbb3a3dea17a SHA-256: b3be76f5bec4d7d4e795c1882a7f84fa5ee7bdd96da5368f956992d509e1c6a4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm with numerous external URLs suggests an attempt to redirect the user to malicious content or download further payloads. The heuristic for a 'download button lure' further supports the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94343295954.pdf In PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/zugajo.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/60339046015.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/gosidetezaluselatujufamel.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/rodesa.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/boxaguxamelinowogidamel.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/39942146399.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/bisebugujefinuretu.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/13056047272.pdfIn PDF document text
    • http://biosite.ru/images/news/file/wewilona.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/kewazisodekinakuzejawipup.pdfIn PDF document text
    • https://europartner2.pl/uploads/86352977152.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/zavagerinap.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26156595553.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/65417544536.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/80074237586.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/45740601153.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/10712546287.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4b948952---77634138275.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wopejuwewaxefugeri.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/sakituruvobefobaju.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/6239956454.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/62000389080.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/zosupuzunuguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+gta+5+skip+verificationPDF 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_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 11164 bytes
SHA-256: c1d26c8fdcb765da2d5ad5d4f03646abb365550ac24d0fbfd256fe072fc1eb02
font_01_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 18600 bytes
SHA-256: 7b6841c1e1d82ec7b6d4fc1590df60307c48dbdee2c3497ef455866bdb927577