Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8b384a2d705d46…

MALICIOUS

PDF

64.9 KB Created: 2021-03-25 15:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 56e25abea53315f23a10a0330dbd5188 SHA-1: a7cda029547f7b4028e218d7498c7a8c5312e4fa SHA-256: 8e8b384a2d705d46ff1a8c5f49fc1de503674a0d59ceb7bbfc33a4b5a34f89ac
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://dafemum.ru/wix?keyword=bismuth+ground+state+electron+configuration'. This heuristic, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document's structure and numerous links suggest it's designed to lure users to external, potentially harmful, sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=bismuth+ground+state+electron+configuration In PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_6029e359dee43.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/d0jbkoY/battleship_game_apk_mod.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/badovotupexokowefe.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/JuxgjBg/javofarixow.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/Jhjmkgg/ninja_blade_pc_game_activation_key.pdfIn PDF document text
    • http://menesoger.iblogger.org/juwipobuweko.pdfIn PDF document text
    • http://bakaxufukove.iblogger.org/bumomibiteruzoxezelekunom.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/78384933938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5ff49a57d1848.pdfIn PDF document text
    • http://manidat.sportsontheweb.net/lisolitaxefuxipolotidak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_604abcb9ed697.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/5d801239-4404-4a3c-8f6c-719e71ce5996/nevif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3a60c5-2b52-4bac-ac92-4f4b949c786c/best_3d_animation_software_free_download_for_windows_10.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/research_capstone_project.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/how_to_find_the_wps_pin_on_my_dell_printer.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/35397656264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396c8eb1-80a6-4cec-a8d4-34b7bdfb72ae/sagolejapef.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/puditaxugatixapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f30a540-019d-4d11-a013-d52aa89fe932/jean_paul_sartres_essay_existentialism_is_a_humanism.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_off0000c32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32F 5484 bytes
SHA-256: bbfb56084a18f2d284a3bb50ac4d517e3d3c6c4ba97af0ea40033717efbf53aa
font_01_sfnt_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 9612 bytes
SHA-256: 5180dad7183028d76bd6dc0cbf0ae88431a6901f513459e46d3e8a23e5f989ae

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