Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c37503c5a3459f…

MALICIOUS

PDF

73.6 KB Created: 2021-01-21 02:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 87f31fb86d22406df62cf16b0598bbad SHA-1: f5b72179ec4bafe92e52c9495a0c1f13e2a14c34 SHA-256: 31c37503c5a3459ffb5faaf0a21a025756e4bcff851e57a67ada9e365a55f76f
184 Risk Score

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=graphic+design+portfolio+templates+indesign+free In PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/kitchen_family_room_combo_floor_plans.pdfIn PDF document text
    • https://site-1256825.mozfiles.com/files/1256825/collared_lizard_care_sheet_uk.pdfIn PDF document text
    • https://site-1227499.mozfiles.com/files/1227499/g__n__m_nursing_online_form_2019.pdfIn PDF document text
    • https://site-1185297.mozfiles.com/files/1185297/neon_health_center_hough_avenue.pdfIn PDF document text
    • https://zokamufonokori.weebly.com/uploads/1/3/1/1/131164159/79b66a7.pdfIn PDF document text
    • https://site-1173264.mozfiles.com/files/1173264/wezuledotigetujugeromemis.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/study_bible_apk_offline.pdfIn PDF document text
    • https://site-1246945.mozfiles.com/files/1246945/directv_channel_guide_boomerang.pdfIn PDF document text
    • https://site-1179590.mozfiles.com/files/1179590/global_smartphone_penetration_2010.pdfIn PDF document text
    • https://site-1225452.mozfiles.com/files/1225452/child_adoption_form.pdfIn PDF document text
    • https://site-1179801.mozfiles.com/files/1179801/82277024254.pdfIn PDF document text
    • https://site-1174959.mozfiles.com/files/1174959/retro_space_shooter.pdfIn PDF document text
    • https://site-1240204.mozfiles.com/files/1240204/dekiwimeromibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujubelajuzuj.rf.gd/62549242517.pdfIn PDF document text
    • http://pekesapawej.epizy.com/abrsm_grade_5_music_theory.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5600 bytes
SHA-256: 9578e478793c1b59648b592acc0e76a3531a36c8b6a1f51e2a684d16fcbde660
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 10204 bytes
SHA-256: 27b76de192ff7c2b5bbeaf9ea7d59f89fd23dd9a2e571a0981b144e7c2afb6f5