Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52042eee3284ee0…

MALICIOUS

PDF

80.9 KB Created: 2021-02-11 06:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f9ca44ed0c34302a1367dc74c04713d9 SHA-1: 3569d2fd2188286c2dd88e6dab16d67755b80315 SHA-256: e52042eee3284ee07f1a8a04765192b6c73590b045c597757d66ac8d5991db4e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=klove+san+antonio+tx PDF link annotation
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/1a9ebf77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fe1877e74b8b.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/jbgjbjc/music_video_with_young_ballet_dancer.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/jhha3dH/64108373008.pdfIn PDF document text
    • http://get3creditscores.info/diablo_2_charsi_imbue_guide4sidp.pdfIn PDF document text
    • http://agreevudb.rest/porcentajes_de_las_bases_nitrogenadas_del_adnjf5yg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_5fdbf1d95797b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/AjeAQhh/51056774027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_5ffe7a38d0c52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5fcb66ed2731f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_600e5e55e40c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punegejofuj.epizy.com/capitol_reef_national_park_map.pdfIn PDF document text
    • http://lezapogitoda.rf.gd/7478478060.pdfIn PDF document text
    • http://jatuxijor.epizy.com/hungry_shark_world_evolution_mod_apk.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_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 4680 bytes
SHA-256: cca8b2032866fb163f2fa9fa3b9f2fed9a2c8b3b72a143e36817c87c90d06d74
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 11504 bytes
SHA-256: 89ed0b4cd492b368458bba0cad5ee4bb3272454d351dec6372918e985119dcd0

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