Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d856c4f4936dcb7…

MALICIOUS

PDF

70.1 KB Created: 2021-03-19 14:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79654ccee30f8a279f4b2f8b473f7ca0 SHA-1: 91cac68f0f6ee2772cad65117489ce138daa9b2d SHA-256: 6d856c4f4936dcb731b770e535a0a43d0277c02e8272b36eb09e8253686006ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://druttle.ru/wix?keyword=red+line+metro+schedule PDF link annotation
    • https://cdn.sqhk.co/senagoxosog/m2rFJSI/caracteristicas_de_las_reformas_borbonicas_administrativas.pdfIn PDF document text
    • http://doordash.link/timosenesekobasigovowev9hax9.pdfIn PDF document text
    • http://afracheat9.xyz/47705311610id4lp.pdfIn PDF document text
    • http://tryporte.xyz/murray_mower_accessoriesb1vz7.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/gihicFt/18652067439.pdfIn PDF document text
    • http://datinge.site/what_is_required_for_aerobic_cellular_respiration_to_occur7c6v0.pdfIn PDF document text
    • http://tehnoprom.org/website_development_analysis_report_template2khmv.pdfIn PDF document text
    • http://skidki-day.site/the_gift_of_the_magi_questions_and_a98mho.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/hzGhfif/71964267262.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/bhu_bsc_agriculture_syllabus_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/hfzbjgQ/47572470601.pdfIn PDF document text
    • http://profer-opt.ru/84618290243srnr8.pdfIn PDF document text
    • http://sdek-24.cc/2013_subaru_impreza_wrx_hatchback_problems88i6g.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/hfgjogd/kung_fu_fighting_song_remix.pdfIn PDF document text
    • http://enots.space/action_adventure_games_pc_freea1qay.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/9752222f-becf-4d4e-b12b-78a7acf9ed33/kijanekofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afd3f5b-ea99-43bc-ba54-d14c85edfd1e/78055044384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31cfb95-4794-415e-a0c5-e2670cbae85a/good_french_books_to_read_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35b3b05-5bc7-4a18-b525-acd5c6834161/flexconnect_local_switching_vlan_mapping.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/poxogexurew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331ac1e4-91fd-48b0-82e0-cc36ae359e97/how_to_turn_on_blendtec_blender.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 4976 bytes
SHA-256: 34be615a3a90d8c4ccdb68fbc21fc9f161076369c2d6267eaea80cbdab217e63
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 11108 bytes
SHA-256: 878fcdbc84701503f3d4812916cb7243c28fb33760546ba131b48c1f9eede657

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