Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edbddc5c0b13c87…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 18:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b7320253b7af78f17e59ab1edec26af8 SHA-1: d2db01a79011763cf2780190b8abb2e962a6a0b5 SHA-256: 7edbddc5c0b13c871c547b4e64d31ee0f1d8e2fc106b2eea8af5670f684091dd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document body and embedded URLs likely serving as lures. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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=administering+medication+through+feeding+tube PDF link annotation
    • http://bcpzonasegurape2-viabcp.com/social_contract_definition_ap_govymkgw.pdfIn PDF document text
    • https://cdn.sqhk.co/lutaxudepoje/FXHheMk/sibex.pdfIn PDF document text
    • https://jelugofinetala.weebly.com/uploads/1/3/5/3/135389066/gojoxelaruvi.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/cji8dih/55952557312.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/gRhjuje/ragnarok_tactics_global.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/djjgi1y/zebodiba.pdfIn PDF document text
    • http://nigasheff.xyz/paint_tool_sai_1.2.5_full_downloadtlv0x.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/gphi2nD/water_me_please_water_game_brain_teaser.pdfIn PDF document text
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/8138309.pdfIn PDF document text
    • http://lesantyqas.online/best_friends_forever_game_review816ze.pdfIn PDF document text
    • https://vovamujif.weebly.com/uploads/1/3/5/3/135318660/62a01d8612.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/fdc85e82-71e0-49b0-a80d-96d4c5b1fe6a/sufomufim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c0f242-7301-42fb-8ee5-388fa2087019/cyberpunk_2077_xbox_series_x_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9255e8be-a712-4c2d-89a9-046d8e021972/loxagifuzigexenugenexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea26c41b-7531-4df0-9b18-48bc9072c879/how_to_use_peavey_vypyr_vip_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e46c40-a52e-43b1-ad5e-819dbe1bcf7c/surah_yasin_full_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1ab573-a2d9-4ca2-a8c9-ff424fdcc151/what_is_the_best_alexa_to_get.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_4b2e93eb2ed1419486ab8ee1bdacc971.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c76e6c3-2e23-4f3d-84b5-66f85cccd01a/which_spin_bike_is_the_best_for_home_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ca4dff-fdee-414b-b7c3-0271a58809e8/add_2nd_edition_ravenloft.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_8b80813c98d84674913745861d9af8a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6425bc-be48-4288-b572-0f00120bec19/how_to_cook_in_a_turbo_oven.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5532 bytes
SHA-256: 7c096ffbaa189db04ed32d557404afa977c3d29747fe5fa8e252ef437b391b29
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 10624 bytes
SHA-256: a8829de263c3fbf31dc5afbc7371a91671c7ec0f67c3fd73614393ae9500bc64