Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe714752c0a797a…

MALICIOUS

PDF

77.5 KB Created: 2021-03-31 05:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e2b064de0bad6ff403da092c3e412ef SHA-1: 904898da1711bf5967607a2a8d69d21c076d7d87 SHA-256: 2fe714752c0a797aef2f71d85d5e4253cea78ee046bfa52ed26126640cecaa22
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 0.9991

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://dafemum.ru/wix?keyword=radioactive+decay+worksheet+middle+school PDF link annotation
    • http://olipaka.xyz/91786725741ixg8q.pdfIn PDF document text
    • http://4gusevshop.space/967821684147fxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_604ee861891f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5fcae5c12bda5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_601cfc4cd440f.pdfIn PDF document text
    • http://supermagazforsale1.xyz/pre_marriage_awareness_questionnaire8jyhl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_5fd7ceefd0b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_60233a7a00fe7.pdfIn PDF document text
    • http://cmbclientes.com/bitumikrpwcy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5fe5f06e17dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_600c933107745.pdfIn PDF document text
    • http://ductsunlimitedins.com/modelo_contrato_de_arrendamiento_de_terreno_rural_en_colombiayu4my.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_d7129b14c2924b238a899f13c7ca9752.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_00c3c1500a76415c9324aefcea322003.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_828f789963db4ed88f445a275a3f040e.pdf?index=trueIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_46d5ebb8d5c74fae94d98d99d9e9e59f.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_fb4661c36dba49fb9b432a5721809a3c.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_cc4b7892236746d5bae89595de3d7426.pdf?index=trueIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_4be6ee4c98c9418898551d8e2e4225c8.pdf?index=trueIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_78e15e1e0fbc4261af492ef6e0c18d3e.pdf?index=trueIn PDF document text
    • https://a2d2c786-a255-4d30-aaac-3df02bc54f47.filesusr.com/ugd/c345b0_f8479509abf044dfb8e619fcd668d89c.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_2a0dd51fda81434a9e92cee5c406567a.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_5fb202841bff431887243067bf0f1562.pdf?index=trueIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_53a6681c96a949729283ba3220ceb6c4.pdf?index=trueIn 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_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 5504 bytes
SHA-256: e9fc55b652a6c6104b5b359f833f85557ff8bb7c3d1b1420d64a0d39b4b52c44
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 10708 bytes
SHA-256: 9b6bd84d83db798dc89a6cbcd76f8dee433de5d02aa753b762d90e70d1299ab1