Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1c4f17e04c2d28…

MALICIOUS

PDF

107.0 KB Created: 2021-04-29 10:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3cc244b9ca1ca07baa0b89c0aad2f5c SHA-1: 5dab4fe17409934c3c726ef80f71d1b7874dfd76 SHA-256: 5c1c4f17e04c2d28eb1d8512a6d65b037746ee84a3bd0f303bdb7e8fbbdda3d1
226 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and link farm distribution. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common tactic for malware delivery. While no scripts were directly extracted, the presence of numerous external links, including one to 'kuzutuzo.ru', suggests a potential download or redirection mechanism, possibly involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=omnisphere+2.5+vs+2.6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493578/normal_6008d1ed3d7eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5ff2809c3c170.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/tunubel.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/sorowizalivoj.pdfIn PDF document text
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/92af9ef6005b.pdfIn PDF document text
    • https://pidujalibogi.weebly.com/uploads/1/3/1/3/131380128/df8d131404b793.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/zubawuzukatanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_605795778c135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_603c330d4fac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fd65d130049d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_601981c0bb90a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420230/normal_5ffa7c4891d8e.pdfIn PDF document text
    • http://pizolizuvupomip.iblogger.org/91890837314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_80867a14e43340d1b3d6025819159bce.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_c406253d27314ae9bc0c97527e8248a0.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_7838fb8d294e49c29d6e44fc812e735a.pdf?index=trueIn PDF document text
    • http://romijudof.rf.gd/garmin_gtn_650_price_uk.pdfIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_ad964694e16c4dca92bb03b7f95093f1.pdf?index=trueIn PDF document text
    • http://fabevax.myartsonline.com/54750122744.pdfIn PDF document text
    • http://sapumazolexu.epizy.com/74482519217.pdfIn PDF document text
    • http://tiwemevi.rf.gd/dafobatulajumujisate.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_ff52ad01c2e9489e8f9f5541e2cb83e2.pdf?index=trueIn 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
    • 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_off00014e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8C 5348 bytes
SHA-256: dd87ab97d3d5cd9765f714b94acf6682c191819089b058cafb6d6bb7505d0a9d
font_01_sfnt_off0001609f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609F 12016 bytes
SHA-256: 0ba1fc586a40e0877ca00eeade088d1447d066fef036da5d89c3b78bd98fb0af
font_02_sfnt_off000189df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DF 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

Open this report in the interactive analyzer, or submit your own file for analysis.