Malicious PDF — malware analysis report

Static analysis result for SHA-256 da027f85c1b66ed9…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 15:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: edaa680df5918b47b8e692e215897f74 SHA-1: c1b897baa549ac93f7438efb1f88b7904ce6f5c9 SHA-256: da027f85c1b66ed91ad8efa7c8316f855ebaba8d3c34d2c6339568a7d832263a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded URLs, with a primary focus on directing users to a link farm designed to host various PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a malicious intent to distribute content through a network of disposable domains. The presence of the URL 'https://bologen.ru/strik?utm_term=how+long+to+charge+jackery+240' suggests a phishing or scam attempt disguised as a search result. No scripts were extracted from this sample.

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
  • 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://bologen.ru/strik?utm_term=how+long+to+charge+jackery+240 PDF link annotation
    • http://lilubaxubaxulu.sportsontheweb.net/geographical_location_of_nigeria.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/26302500988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_602e1dc48cb04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_5fd924ec5365e.pdfIn PDF document text
    • http://dojisef.iblogger.org/gepebib.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/kijidoxajinigironos.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/40386573678.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/69b8d195-33fe-44fa-9467-1b591dd030ae/dork_diaries_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f2c936-2d53-4192-bbce-70d267de6745/wufigexa.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/bescherelle_conjugaison_espagnol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0eb0b65-6e95-4c1b-b697-4c6b8bf57113/bozojif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddca9016-1389-4333-b557-383cc4ba8aab/arduino_uno_programming_code_for_stepper_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2add48-b643-4e60-9eb4-6f933a4b5fc2/28525099393.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/skewed_t_distribution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0468823c-3c4f-4f18-b05c-245afe8ebbb5/does_directv_have_music_channels.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/zarosarozunivawavujolenul.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/grounding_techniques_worksheet.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 5540 bytes
SHA-256: 2520e96355112bdd49d197a1a86271310d4bddfc89fdfe67b4106845a69173cb
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 10908 bytes
SHA-256: 539b7145d0d26dcd1d73532f703f734a04f01973f88a23780b32be75712f86f5

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