Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dccbb6438fef274…

MALICIOUS

PDF

73.9 KB Created: 2021-04-09 06:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f5604f4b594a3cbc641c1c9ef956ad3c SHA-1: 2ad6ab4df7a3dc14dfe382b66f5d830cc0882af4 SHA-256: 0dccbb6438fef2745ac679c0f2afaefde2c48a3c3e1698dc2e17c1694057511e
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL, https://kuzutuzo.ru/strik?utm_term=how+to+know+the+caller+id+number, is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'caller ID numbers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+know+the+caller+id+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407327/normal_6010c5fa8659a.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/ygdgegi/love_letters_for_girlfriend_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_5fd665b362df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_604662ca2f7c3.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/hjhiMig/guzenivo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/90iiZ3u/one_god_lyrics_slaves.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/artificial_intelligence_trends_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6010051cd0bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_6035821061355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ffbd5b09bed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_603701bb45295.pdfIn PDF document text
    • http://bupitubegedew.getenjoyment.net/35739266460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_605591732bbb6.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/jjielKw/cyber_hunter_pc_hack_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/jbaOgjc/32865795031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5feb18ce8170a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f10bec-97c3-4d8f-a6f9-c8b792a277f5/52431383856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c68dbe-ae9a-4153-8527-81167f99679d/47003265051.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/netepif.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/teneti.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/lithium_chloride_solubility_in_dimethylformamide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb535636-367e-4e7b-854f-0ee375374542/83213677135.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/bobby_deol_barsaat_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8467071e-b9d4-45d6-b4ed-145ba2791925/conflict_resolution_strategies_in_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/how_to_add_yeast_nutrient.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5260 bytes
SHA-256: 72485251c4b6a91da389c5bbfb77b470457c4d528ab0f26fa31950cb39c74dd3
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10656 bytes
SHA-256: 1306c78df068703a88d3027f2df241712d602677700ee27596d62c5593a95216

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