Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b9cc7d4c8ebabc…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 14:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: acae4f68213619510f5a51b252f4d079 SHA-1: c27ce600cd318e6af6c4c787ebfbcae2a4d2270c SHA-256: 97b9cc7d4c8ebabcdcb12af568f7955c8101d6f56f36d4d977696acb16bc6846
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs pointing to potentially malicious domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites, masquerading as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/wix?keyword=cell+structure+worksheet+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481282/normal_604354b115b9c.pdfIn PDF document text
    • http://electrumwallet.buzz/alarm_chrono_watch_instructions_walmartuf5nl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60147ced94cfa.pdfIn PDF document text
    • http://gitikevajup.iblogger.org/79502756971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_5fd81af409cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_603a7969857e5.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/1r2ePnC/59434612994.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/MjeS9Kb/93044575111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_602352da47d7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ff711d801b29.pdfIn PDF document text
    • http://urott-hu.com/990101154812w0tj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_603103cbcbf77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_603868fa00ade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tevezizexuvifuj.epizy.com/how_to_clean_rainbow_vacuum_power_nozzle.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/7098549234.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/apache_netbeans_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/accountant_experience_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/proving_trigonometric_identities_worksheet_with_answers_doc.pdfIn PDF document text
    • http://zisuvedo.rf.gd/wutamon.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/38718642603.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 4808 bytes
SHA-256: 69b4049385cf81725484d52ef5295f7ad27a87adde52d2b01199615f93a33156
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10192 bytes
SHA-256: bd04beffa6014c86a168e9db2b2695d1439e23bbb505cd6595dbcbfaa3177876
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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