Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8fa54da86c7a00…

MALICIOUS

PDF

88.6 KB Created: 2021-04-03 15:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37cb02f0f9daafef4716f3b1791feb6f SHA-1: b8efb43e7d0270ac294b4ffa4109529680fcc849 SHA-256: ea8fa54da86c7a0009c620bb2a8d9edbff5261a9c2337129c438a0d35c234264
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://soxebez.ru/wix?keyword=introducing+python+pdf PDF link annotation
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/dodokikazirodojejun.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/difTR2s/65240826543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_602e59f1c702c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366057/normal_5ff1fb9b494f3.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/hjjipij/mini_bowling_alley_dimensions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_604fab8b7804a.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/navomudazitepi.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/fjbgdie/dopexikugujojiwiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_60219444b16fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489596/normal_5ff132f30995b.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/qihgfgi/72195935432.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/eihigh1/terigubu.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/eNGxkL4/38309420248.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/5jcOJoN/29873682890.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/d45d9d16-e6c9-438a-85f1-57cad1975741/14386702896.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_ffab8e6421b54d9bac23760de9d863b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d418af36-513f-438a-8212-d164791b63ab/93503753113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6123e04-022c-408f-b24d-faca497db0c8/the_kiss_of_deception_plot_twist.pdfIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_27489e77855d4801b67a949f3b104ee0.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_ac94b100379c44b8a480e43da34550cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f37c05-f818-4cbc-aab8-2c2b7fed1c9e/lutevukizijokan.pdfIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_21f54359e76e433494af0ce01e6f8716.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c301cd-a2e0-442b-ab90-f035afcade6f/excel_formulas_multiply_by_a_constant_cell.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_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 5036 bytes
SHA-256: 2bfde3198d3a629c0122d80f3954d05ebd8a43943e225d7f5b2b9e81c1b6dc7c
font_01_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 11904 bytes
SHA-256: 2affaa17013148d9c94e901e70c44ee892e0bfa9084ddfca80a03ecbf2d9c33a