Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57555b66206f62d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 23:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 13a2db2e34b0371eab2dc7ab122df179 SHA-1: b122641a52fd0e8254ab272640061566097846db SHA-256: c57555b66206f62d2272d95e323a2373fac956027b339711cdc97dcb4ad7170e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable or suspicious domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The primary purpose appears to be directing users to potentially malicious content hosted elsewhere, rather than containing an active exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=angka+penting+pdf PDF link annotation
    • http://piwofoterif.sportsontheweb.net/tifikubolewamatilovoberi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5ff7c8a9ec8c1.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/is_billy_elliot_on_netflix_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_604b6f8930d2b.pdfIn PDF document text
    • http://viwoxufegoger.sportsontheweb.net/1st_year_biology_key_book.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/11624179432.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/accountability_partner.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/trig_functions_of_acute_angles_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_509fa7f1d8804ea484c79dc5fada1a18.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_ceb1698222fc495fa140e24ee9303fc9.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_214691de09474837ad9595a338d87277.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_71408031a18f490ab3fd4bfe21cb9f21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/85843866791.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_91967104dcff498fb3629df6bd04a7a3.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_cb0cbc62ac1841c8aef447eaa6a7b4d4.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_282428f9c05b44e0b0fd9e0c1bd24d6e.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_25870090c295453db33629716f1406ec.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_4f671b48794f4cf7a2d32e9e5136adad.pdf?index=trueIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/70395099874.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/80371224503.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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 4956 bytes
SHA-256: 8dbf1d892b99e5efbb28ed0ca960002e3a6483db075235f73146d165099c023b
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10120 bytes
SHA-256: 73473b355eb6c948a8016d27d95d783a11851a89faa0cc8283a2f451835e52b9