Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a0f264b06a5e9…

MALICIOUS

PDF

71.7 KB Created: 2021-03-05 02:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b67cf5fdb3d26b0b9960a0e370396ce SHA-1: e5d40833fd0bf6f70f1384f8e3713781fae128b5 SHA-256: 3c8a0f264b06a5e9eb4b8051c7a53bc6307e285760e8205d46c51121c1056f18
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/strik?utm_term=esto+que+soy+eso+te+doy+acordes PDF link annotation
    • http://bitalotava.scienceontheweb.net/basedubalalebetuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_60217e5a85a88.pdfIn PDF document text
    • http://paganel.world/26_as_formmb1vo.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/what_punctuated_equilibrium_mean.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5ff151589b1e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5fe164cbbe9b9.pdfIn PDF document text
    • http://bestcreditcheck.info/project_management_book_of_knowledge_6th_edition8ewik.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/what_to_do_if_you_fail_pre_employment_drug_test.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/how_to_measure_pulmonary_vein_flow.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/does_apple_tv_have_a_remote_control.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377924/normal_5fedf5d08df33.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/3007f799-a495-468e-9b88-f0758d540c31/90754642671.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/setujosajirifavik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a6e167-d28e-48bf-85ce-b57f2e1fab46/bloomin_brands_franchise_operations_specialist_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/44838509950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5eda572-45db-495c-8f49-b5466ba8e625/brother_mfc8950dw_drum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a061518-8c46-4a34-a6a7-34a00ae4a9d9/how_to_install_autocad_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85427374-437f-474c-89e6-39312547b1fb/how_to_hard_reset_moto_g6_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/216b9ec2-c24d-4987-9555-287dcdaf2274/lufinejobefoziwovivepomum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d753a209-6df6-4db6-b629-1a02e4eb3aca/how_do_you_fix_no_dial_tone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233f0f1a-3bfe-4a09-9367-3879a70c3f39/zenusoviwalogakimavoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0153549c-cd9c-4160-80fa-f9fa4b14529d/14258339951.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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 5084 bytes
SHA-256: 5adb107853982d502582a1fadd7057fc2b64ea2f8e1902ddd50b389fafa274f3
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 11204 bytes
SHA-256: 4325ec9536d886354d4ea22b9afa8f7ab295e732e3d0b0760eeb9dfef4b22d41