Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6b1976a32fc2ce…

MALICIOUS

PDF

75.0 KB Created: 2021-02-24 22:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f046e68d6fc2fc45d819efb5ef127756 SHA-1: 89376cde16d0f6db1069f4a1d100e28bafb05ced SHA-256: ba6b1976a32fc2ceebe44a716e75753408319a6e340758acd1fa49baa1511c37
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=the+kite+runner+discussion+questions+chapter+16', which is a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+kite+runner+discussion+questions+chapter+16 In PDF document text
    • http://vivekawiga.sportsontheweb.net/health_psychology_biopsychosocial_interactions_9th_edition_citation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_601c6bc404700.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/45615832627.pdfIn PDF document text
    • http://jasapremium.xyz/reading_plus_answers_level_a_fulfilling_job4a8ca.pdfIn PDF document text
    • http://nicepics.xyz/keripiwinidifidunijemavvwy.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/how_to_use_soap_header_for_authentication_web_service_in_c.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/38377226238.pdfIn PDF document text
    • http://khanapoorti.com/1414944545btxdr.pdfIn PDF document text
    • http://complerbnp.com/49776873383n8ddn.pdfIn PDF document text
    • http://dusexixegiseves.iblogger.org/how_to_change_groupme_phone_number.pdfIn PDF document text
    • http://about-igsupport.com/tooth_abscess_treatment_guidelinesuk3x3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takateg/6992996380.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/steam_workshop_er_ark.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/platform_9_3_4_real_location.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/domain_and_range_worksheet_kuta.pdfIn PDF document text
    • http://girofili.myartsonline.com/geometry_chapter_3_resource_book_mcdougal_littell.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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 5472 bytes
SHA-256: 5c17b4753efe616b90dbd72d7e4122b53261c6934ae76c32b4980646ffc0dce8
font_01_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 10708 bytes
SHA-256: bc8e12cf0fbf6c9d533b3e7accf5e289b81d5568ab89e60a465dc33985824e99

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