Malicious PDF — malware analysis report

Static analysis result for SHA-256 423ddbaa76d1ce81…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 07:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73b650cb803e1edf05f33c8ad6ff9108 SHA-1: 2ef0e89b6ed9d44b53f9179101cb3285848e0ac6 SHA-256: 423ddbaa76d1ce816efcc3bb860cb4905a33a0e55e6acd13c9f17e4002eba1be
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous links, many on disposable hosting, and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, likely serving as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hvpeds.com/upload/contents/file/molatipisuru.pdf In PDF document text
    • https://hyundainhapkhau.vn/upload/files/38883205681.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/sijisitenaweziv.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/84909711572.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/89675677058.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/jetuzitopikumeti.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/58156822371.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/fepoloto.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b8a75b408---bezudevefimifuvedil.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zebubimakimedigovixaga.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/68983015987.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pemigokiwinenosu.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091912440713.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/64740946220.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/fezuwunikofuriximodamize.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/33257629119.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/82379180460.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109162126007542.pdfIn PDF document text
    • http://yuli-china.ru/d/files/28774439425.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/gixop.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/756226ae8f167f2153c7526a4e02945c/58752487831.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/kuzerezusubinonowolapefom.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/sopafe.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109121906052370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=is+it+possible+to+see+who+views+your+instagram+profilePDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 11264 bytes
SHA-256: 38add4684a6da465aab0c428b32da73936c6f6ddf532a464f30c52c52dd0419b
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 18440 bytes
SHA-256: 803b2ff2edf1b3672b77cea3619161f21f02bf79340cee6058e4f4ed47169a1e