Malicious PDF — malware analysis report

Static analysis result for SHA-256 943fcfa8d3552d9b…

MALICIOUS

PDF

84.7 KB Created: 2021-04-07 21:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 01a93a4e577bc4901eb67ea391cdcfbc SHA-1: 1e8b2c8287b8795577d6d10d21890b679dbdbb6c SHA-256: 943fcfa8d3552d9b5036a6f5bc3f7c69d04a004ae6c43f120f39e860a80c1298
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. 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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=practical+electronics+for+inventors+2nd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/pekebugus/ejiiTjj/piwed.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/hcKhagd/domuriwaf.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/kanali.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/aJVibUX/playstation_5_best_buy_cyber_monday.pdfIn PDF document text
    • https://solupebasil.weebly.com/uploads/1/3/5/9/135972399/winun.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/agj4fgg/zombie_hunter_bb_gun_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/ZI9hfhi/xerewonizun.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hcpiakK/general_hospital_spoilers_august_20_2020.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/vuxalirudidel/92224022445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a2ffa3-c052-4007-b4ea-bd431990204a/vuvipebusonotix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af55754-b997-4569-acf8-fce45f498130/fenamomizunukuzafafekuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26681593-e108-4b91-9384-55a8da8760da/ruthless_by_william_de_mille_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/jenn_air_electric_range_control_panel_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c839a429-34e9-40f3-b26c-c3b37e87dca8/best_survival_movies_on_netflix_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78db83ea-aee9-4724-8b2f-f8ecc1d00857/40345206834.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/mckinsey_7s_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/apoorva_sagodharargal_tamil_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/76955577026.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_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 5344 bytes
SHA-256: d651ed292d9d9d9455db6bf8dcde0adb3c5d126c31428ef0600e46242871dffd
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10952 bytes
SHA-256: c543094f3043a1ccc7395eeb8d9b7bfe6a2649a9f5da54258d07a4c65c9763d5

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