Malicious PDF — malware analysis report

Static analysis result for SHA-256 963fe83884c3b2fd…

MALICIOUS

PDF

74.5 KB Created: 2021-02-25 13:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec9ccc220fd138997419232c3f170d5 SHA-1: 9760273f4c83b3cddf9f41c430234f0aad69e38d SHA-256: 963fe83884c3b2fd85f84767b005f152ad48412c99386aec75598e172746e2fe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=rocketfish+full+motion+tv+wall+mount+instructions
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5ff9aa0e183d8.pdf
    • http://winoxolupuvil.getenjoyment.net/recetas_de_cocina_para_el_ayuno_de_daniel.pdf
    • https://cdn.sqhk.co/poniroxam/mhcxvmW/hd_movies_free_download_bollywood.pdf
    • http://probnik1313.tech/vineland_iii_online_scoringcz614.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/4357940.pdf
    • https://cdn.sqhk.co/leporolino/hhjjbR8/gufibolidadimumasevufu.pdf
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5fddf9b473ea8.pdf
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5fd600b76ec92.pdf
    • https://cdn-cms.f-static.net/uploads/4392442/normal_600cb5ac6cd80.pdf
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fcf760070957.pdf
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/tosojodiba.pdf
    • https://cdn-cms.f-static.net/uploads/4495241/normal_60128dfcb7787.pdf
    • https://cdn.sqhk.co/fuwegamuvev/ijh4idE/48283538928.pdf
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5fffbb0e826b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuwutexo.onlinewebshop.net/kowitomizorufojotuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cd.bin
0e3b1ed62839471fb58e2dfe6a471fbe7281c73e7d4c04e994327ba976166282
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 5344 bytes
font_01_sfnt_off0000f9ed.bin
93d6c2f2faf315155e1045b051b519a998bf214eaac5aadae05bc99d5a8e064e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 10184 bytes