Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7bfacc7810459d…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 11:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e752882fd887827427b699fc90fd8d50 SHA-1: e273f9bccc0d3fe2606523ea1f1750bf7db8a3c4 SHA-256: 8c7bfacc7810459d934295dd760526371273df1849375ee066e2a07e6c9dd5be
156 Risk Score

Malware Insights

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

The PDF file contains a link farm heuristic, indicating it is designed to generate traffic to external sites. The primary external URI points to a suspicious domain, likely intended to host phishing content or malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://kuzutuzo.ru/strik?utm_term=what+is+a+thermal+switch+on+water+heater PDF link annotation
    • https://cdn.sqhk.co/funixatugesi/haR5YR4/45513503926.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/fadeborajad.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/58A7DHV/46521148175.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/e9bd946d.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/ibMvk57/best_cashback_deals_on_broadband.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/rknjJgg/virtual_friend_app_reviews.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/a90f7275-ca7b-47ef-b0c9-faa6cc2cff16/how_do_i_set_my_pedometer_for_walking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6a58dc-7cd3-45f9-a06b-dd54b7a50c47/how_do_i_change_my_adt_master_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf8db07-f8ec-4f71-bad9-7d511b01f7d2/raizes_brasileiras_contagem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab89ce3b-e272-4845-acd8-f79ba98f66f7/gelezep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421720d0-e507-4555-8569-bdd5dc92458a/54093401432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31596fc5-6090-4a0f-89f4-961f79d553f2/how_much_does_emr_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d353811d-3000-48e5-bc83-2b770429d34d/is_the_uglies_going_to_be_a_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb0d732-d09f-47d9-a876-f5aef219fd5a/what_is_lean_portfolio_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a717474f-0567-43aa-8925-6a53b91d97e9/sujufuxelofusomatibifaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eade7f5-2d2c-4e68-983c-0d49b2438c0e/belokiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0838da2b-04d5-4429-9cb6-19805e5e9f18/how_to_change_g_shock_mudmaster_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23f54ae-ed32-4872-a8d0-55e486e03ea8/how_to_turn_on_philips_gogear_vibe_4gb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1a3158-8df4-40fe-bc5e-6a3aec364c28/51167978576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbadddf-2784-4a94-b866-46140f0bb491/how_to_reset_epson_lx_310_printer.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_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 5144 bytes
SHA-256: a104466af688e6a5aff84dabb6134fee29f0ec5e716cde93366b214d741a58c6
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 10496 bytes
SHA-256: 57ad4315ac35539c8c7badc7bb6c0eed90228659bd965c86b67b484897e9b539

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