Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d3df27ff6d028a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-20 12:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e2cd53e0361dfed6846e55f6958b83a7 SHA-1: 6a4653d30fe15326b2c9c60f4ad95649831c3ad8 SHA-256: 47d3df27ff6d028a69b93ed689ecc3b224c8a09e9ea673e2799eb24c07c2724e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick users into installing browser extensions or updates, a common tactic for credential theft or malware installation. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/strik?utm_term=ms+word+shortcut+keys+list+pdf PDF link annotation
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/5182797.pdfIn PDF document text
    • http://meetsalon.xyz/sikureruvobowizosowax4jkgq.pdfIn PDF document text
    • http://findfreegirl.com/aov_jungle_guideb09m8.pdfIn PDF document text
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/8696425.pdfIn PDF document text
    • http://bbcua.site/android_arsenal_custom_progress_barlg403.pdfIn PDF document text
    • http://migerov.xyz/goodbye_days_jeff_zentner9kc0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_600dc9464b8a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/diagnosis_and_treatment_of_lyme_borreliosis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/affirmative_action_hiring_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/88562954983.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/papujunup.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/regorokokazajevef.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 5296 bytes
SHA-256: 0a12614d3886c146d493306049562e2db6a53e96922a7020641f9455a655acd5
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 11968 bytes
SHA-256: 0cbcbf6c6c921a162bd460b0eee06496fd7982f4cb3f56b2dec7bbd2277976e7

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