Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71423c412857052…

MALICIOUS

PDF

52.2 KB Created: 2020-10-02 16:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52aba0cc58b53585715119771f0f9d75 SHA-1: 9e4f5857e345a70df2701cee77adc981b7f9883a SHA-256: d71423c412857052875a3f9997c27dc0e74ae310706a142c02df227cf7bfc19c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting domains and redirect to a malicious URL. The document body, though obfuscated, contains references to the primary malicious URL and other PDF files, suggesting a link farm designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://cctraff.ru/strik?keyword=ejercicios+resueltos+de+acentuacion+y+tildacion In PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/60027342964.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/xoduparejaxipodufiz.pdfIn PDF document text
    • https://site-1037096.mozfiles.com/files/1037096/garofurenazolu.pdfIn PDF document text
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdfIn PDF document text
    • http://files.phchastings.org/uploads/1/3/2/8/132814593/zewarurasanibe-wemagirib-moxojo-mipitoses.pdfIn PDF document text
    • http://files.aztecbaja.com/uploads/1/3/0/8/130874015/nipono-faxolizuzokiluw-sulub.pdfIn PDF document text
    • http://files.jennhassin.com/uploads/1/3/2/3/132302944/mugamanod.pdfIn PDF document text
    • http://direbaka.ysk-chb.com/uploads/1/3/1/4/131406676/tamazemowesojimidal.pdfIn PDF document text
    • http://bifinarop.selfstorageofsanangelo.com/uploads/1/3/1/6/131606008/4ee1d67aa334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0944/0935/files/63028208736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2892/7896/files/solve_each_compound_inequality_and_graph_its_solution_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5470/6069/files/social_security_office_syracuse_ny_fax_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/standard_fire_insurance_company_quick_pay.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAF 5068 bytes
SHA-256: 6c1cd89e9a9b283b73c4ea442dcc1e58752e903421030b22501a911a0126c4b4
font_01_sfnt_off00007d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D08 15236 bytes
SHA-256: 6f39bbf98ab23353b73ca437a29b6b883f538b0588b2ca02d39bdc5f309b0eca
font_02_sfnt_off0000aba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA6 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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