Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3313c6da620ccfe…

MALICIOUS

PDF

162.1 KB Created: 2021-02-24 06:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fdcb7f3444b664a3f80d12cedb833c0f SHA-1: 2bc8e33116f39434818d42f66c3a5ff1a0672c8f SHA-256: c3313c6da620ccfee8cf6dd10cdd2b6c8faa313c97048cb82be8d3de2c15b2f1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This URL is likely used to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=what+age+rating+is+classroom+of+the+elite In PDF document text
    • http://waniwidolo.66ghz.com/elements_of_design_definition_proportion.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/Q1jigs1/bamepujig.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/87913567430.pdfIn PDF document text
    • http://nutapobo.iblogger.org/hoa_architectural_review_form.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/gihiSFY/dub_dash_apk_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/jj4gjnw/hero_tournament_super_stick_saga_apk.pdfIn PDF document text
    • http://rivuxini.66ghz.com/27102117209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajoxutevo.epizy.com/reformat_all_code_phpstorm.pdfIn PDF document text
    • http://matemot.epizy.com/bid_bond_advance_payment_bond_performance_bond.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/40076641856.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/xokewuwopedometep.pdfIn PDF document text
    • http://rafidomemekovig.rf.gd/ruxuxapaxufafi.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/fccla_planning_process_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/whatsapp_for_nokia_e5.pdfIn PDF document text
    • http://nujisebiko.epizy.com/29258116231.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/vinavomiravevade.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E4 61164 bytes
SHA-256: a03dd09e14f4d9b6783be0306ffa9d643b87a43484d35a77955e125d4d197585
font_01_sfnt_off00022a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A23 5308 bytes
SHA-256: e3eda469920dab997d165f6043dadd7b1d48faa837b363cea5c0de64d52ebd84
font_02_sfnt_off00023c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C1A 13100 bytes
SHA-256: 38db1a31d2ec365047139f318914b9cc29823a37a449ff236c6b4d735ec036f4
font_03_sfnt_off0002658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2658B 16076 bytes
SHA-256: 8e080451972fa98aa9e3536045215e62b9f74f9d761fc20c19baab760c38cae8

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