Malicious PDF — malware analysis report

Static analysis result for SHA-256 581c8091b79d3e65…

MALICIOUS

PDF

65.6 KB Created: 2020-11-11 02:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2d747ab5cd84e549443d44f0279b30ac SHA-1: 178fb3abee081c51689267fe94e1fd0a2c20d482 SHA-256: 581c8091b79d3e655d3a33c85247e967e5d934e15c5ba33f76e47d8af24243f1
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://ggtraff.ru/strik?keyword=instagram+view+private+user In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5f9d06c152f76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f8dd932bd495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5f95baea4738a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_5fa6ea0390ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5faa36767f1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_5fa791f08db36.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/7ab6c4a4-0c17-4d46-8f28-265baaffae16/gerosenujavovura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51eb9351-b964-4c82-b579-2c64c77206a2/a_christmas_carol_discussion_questions_stave_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/vibosoroxukizoredokupo.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/pathfinder_kingmaker_feats_for_wizard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7fa6fb-c914-4ce6-bf2a-84a2b238ead5/rokifivagotaxibexasadoboz.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/34062951210.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/lion_king_pelicula_completa_en_espaol_latino_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gusaledikugumo/al_80b_modifications.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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 5196 bytes
SHA-256: 4899c734c04441da82e526181759dfb1d9d064ed4fdaf71e155d004378f76197
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 9900 bytes
SHA-256: 756a94b18ca203ee71cb231a0662619e62db6c1465eeee579d12681ca0c3d5bb

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