Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4a2fff9087651f…

MALICIOUS

PDF

93.0 KB Created: 2021-04-23 21:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3d71a2f0b345a6a82e25e4b7fd547934 SHA-1: 24213577d4e586071fa58ab52cb0128e5d19db02 SHA-256: 0a4a2fff9087651f1d417eda7258635b0acd0ceef1c1d560248985c3198c3347
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?utm_term=best+dab+clock+radio+with+bluetooth'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=best+dab+clock+radio+with+bluetooth In PDF document text
    • https://cdn.sqhk.co/jopubelo/fOsUkhb/phoenix_arcade_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_604a5525d9095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_60341b60cface.pdfIn PDF document text
    • https://cdn.sqhk.co/fixuzigetir/hehjWXT/rogue_ninja_tap_idle_rpg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fefedccb3bf5.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/ha7f3AW/bsba_operations_management_salary_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_6044220b038fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff15796d1a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_6031c95cddcd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fd783070fb74.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/dd714165-396f-4d30-9e8a-261fc32e426e/examples_of_similes_in_the_giver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c011c2-e8b8-497e-8c7f-b1e98c1bf290/pigman_summary_ch_6.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/sparkle_appcast_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8fd754-7948-4e29-9938-7b082979f423/food_safety_procedures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60bef6e-00f0-46e6-9907-0b534648ca88/xamogipugexidaritabi.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/lagu_aye_123_uyeshare.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/form_c_registration_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/76266137734.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/arm_compiler_5_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/eighth_grade_math_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42758d59-77b5-486c-acb7-27d019cc40d7/what_happened_in_the_theory_of_evolution_essay.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_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 5372 bytes
SHA-256: df331b1d2d88a8848b143fab1afee0a0d9172f08a817cf9c9df4bde45d11cb37
font_01_sfnt_off00014067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14067 11068 bytes
SHA-256: 4b0825d1406cb17ad32ef567e5d7b7bba8e08b8df64d144a15d58b98ce0d4eb1

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