Malicious PDF — malware analysis report

Static analysis result for SHA-256 e137ad747209a77a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 11:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7819eb69e573da598eda9dd38da2dfb5 SHA-1: a3b198bf233191e70ee285a4765ee1f976420da7 SHA-256: e137ad747209a77ac7014fd4d19dbe1a9aac578f2f36d33d3c6991f78035dba9
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to lead the user to download malicious content. The presence of a fake CAPTCHA and a password-protected archive lure strongly suggests a phishing or social engineering attack aimed at tricking the user into executing a payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://huntic.ru/uplcv?utm_term=god+of+war+3+remastered+download+for+android PDF link annotation
    • http://www.siposferenc.hu/html/kevepowuzusimivasik.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pekigutewezakixel.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/domokotegiberuzivovup.pdfIn PDF document text
    • http://entrackintl.com/uploads/87045435399.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/70068289993.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/34919901452.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wawesaz.pdfIn PDF document text
    • http://lecostationery.com/files/file/10958294862.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366bfdc9eea---kodorazolepigimixiguj.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/tevawajidepux.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/gixajifamogotafuxizapev.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/20980537780.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/pufefemimiruzavelolupajo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/kanebijesifagamugoroxarug.pdfIn PDF document text
    • http://telecycling.info/files/file/19416694219.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/87658111866.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/denevesi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b221526f7---13018221973.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/nijirisaxosodugobalu.pdfIn PDF document text
    • http://zubrcup.by/files/files/63753932992.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210912_7CFA4E9D4DF8D2FC.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/98516713037.pdfIn PDF document text
    • 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_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 10812 bytes
SHA-256: 754b2b885467fdc34a0030ae0acb0561d8dd70a947ae95ce465977aeda8b13b8
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 18468 bytes
SHA-256: 5c271749e56ea0cdf515e9e42e8d31b821a6109c68ae0f85c10698a78f4ebe79

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