Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4327e1945083a0…

MALICIOUS

PDF

73.5 KB Created: 2021-03-05 17:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4b4fa095e31cfb3676846458197eb159 SHA-1: c743d63665887eba9d87501b33ce62d6872ec24c SHA-256: 5f4327e1945083a04a8858b0015b0489b380e1a5470bff34e2c4ac60fbebb1b9
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous external URIs, suggesting it functions as a link farm designed to redirect users to potentially malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary lure appears to be a search query about a Vizio TV recall, likely to trick users into clicking through to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://zajinet.ru/aws?utm_term=is+there+a+recall+on+vizio+tv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff2dbe349d40.pdfIn PDF document text
    • http://tukudetu.iblogger.org/ible_and_able_worksheet_twinkl.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/15204309846qpb2o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_600bef330e0eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5fe0540e4cf6d.pdfIn PDF document text
    • http://reduslimitaly-official.site/ritetemp_6022_thermostat_manual20yl3.pdfIn PDF document text
    • http://perexifolelave.iblogger.org/xugonor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_603f4a7ea0f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_6023baad10364.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumugipetoje.epizy.com/dnd_5e_monk_character_sheet.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_ee3c9aa01499414f9db77128694ccc78.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_10890f58a463448aaf32e153760febf0.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_045948cc0a4d4835919ffa552ce8981a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd7a4a1-a0a1-4459-b83a-a5e5ffbca629/peter_drucker_management_theory_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94478e3-2569-46d0-b5e4-82b38e40cbd5/50_shades_of_gray_full_movie_review.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_2e2b38edb34f4098bd8f9b27f471bd4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42688ad-b2c5-419d-9342-c57504671284/25905883950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e63e22-6ff6-4de0-a499-13d3b2199adf/bivinedavoxivukij.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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 4936 bytes
SHA-256: 84093101be5c5abe7a5995aef2216f9eff285b06fc524e3d71eb8b19ea7d8735
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 11364 bytes
SHA-256: 9e8e42ff7ea44b4830fe1e051ebb68c1058ea728a98c5a61cfcf644bc100c8b6

Open this report in the interactive analyzer, or submit your own file for analysis.