Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf4a043b3728f47…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 15:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b215b7cd7307ecf8587f3b95e5c3e29d SHA-1: 85fe38e3222038ce2483636d2f5966d06167b516 SHA-256: ccf4a043b3728f47826ea53809f9da0a667c38b8d05c2b7d5deda7713aefe1ee
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a malicious payload. The presence of embedded JavaScript and a heuristic firing for security bypass instructions suggests an attempt to trick the user into disabling security measures. The document body is heavily obfuscated, but the heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://leicesterbiketec.com/userfiles/file/67727199190.pdf In PDF document text
    • https://rawoctane.com/uploads/file/sotiselalupokiravu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/97503100845.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/69836246612.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vufulivosopivijinufivewu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/86636976744.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/47398644150.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/lafovujinetivusisinemug.pdfIn PDF document text
    • http://vitrine-prof.com/files/totatulufitufagasedusafe.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79782761268.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/84516488802.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/zewukumosapaj.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138490513596---73631191585.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/kovare.pdfIn PDF document text
    • http://furniture83.com/upload/files/wates.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/xorone.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/korubemilifuxovas.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/58393505363.pdfIn PDF document text
    • https://reha.bg/content/upload/file/nakatolibeselijad.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd024de2f---pedoxavesefatuwovijuwu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/40911906409.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/21604272321.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/12701246805.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/48268336109.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/78564522640.pdfIn PDF document text
    • http://inercial.es/uploads/files/5391937599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=prince+of+persia+warrior+within+setup+download+for+pcPDF 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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 10904 bytes
SHA-256: 812518340bae7eb80dc1e8ddb07a4e521d56c876abe8a9d983ec0c0fc6b081d4
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 18272 bytes
SHA-256: 96961b704104f81a805d391b6152aa6624ed7f65dd6470d1b1cd9b1c87f5155b
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1