Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a2594e8d5bd9fc…

MALICIOUS

PDF

77.8 KB Created: 2021-04-04 15:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9b91bf322427708dfe6d7d33b15ee324 SHA-1: 6b5829650d2ee5d962fdee1a0830cd79839a84f0 SHA-256: c9a2594e8d5bd9fc6a020aa13e8e8eef565ff7ae8d9f2aa8b73c061584dacace
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, some on disposable hosting, suggests a link farm or phishing operation. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, but the primary malicious activity appears to be the redirection to external URLs, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=john+deere+60+inch+belt+diagram PDF link annotation
    • http://bestpriceforukraine.xyz/gizimaarbxt.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jajdDjf/zabinuxivatusudo.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/CgiaXVD/steam_download_slows_down_internet.pdfIn PDF document text
    • http://beliyden.xyz/what_is_the_theme_of_poem_gabuqax59.pdfIn PDF document text
    • http://supozupewurak.22web.org/peter_drucker_management_guru.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/QZoic5K/tokepodif.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/41297dc4-7b66-48b6-9799-014717fb0ded/jedifaper.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/how_to_reset_printer_after_refill_ink_canon_mg2920.pdfIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_c2ad187b6a6849c1b76afe6e7e5eb888.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_14ec0681626e4d2c8ecbab37dc49430b.pdf?index=trueIn PDF document text
    • http://riwexakax.epizy.com/miwefubagev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec375547-3f1a-41c5-8825-0a4be9092c0c/mapozigodo.pdfIn PDF document text
    • http://xexasuwoxomiba.rf.gd/cdc_fact_sheet_chickenpox_vaccine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd9080e-8582-4c2b-a690-2f4a3fd3c2b9/universal_remote_rca_code_list.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/87543210555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c61fa5-8a89-4f51-a137-e2d81406c668/who_is_lucifer_in_christianity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac11a0f-27b6-456e-95f8-d86f132ee736/why_does_ryuk_kill_light.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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5600 bytes
SHA-256: 2f834a7cffd16de601595d399b3d1f148e153f9b0cbfeaf6ac93f306d21b2a41
font_01_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 11296 bytes
SHA-256: b88e0d7d79a7bec9018e3d89c5f9ea4f3c441a80fb63e2e9fc787a67f7ddcf21

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