Malicious PDF — malware analysis report

Static analysis result for SHA-256 4546689348acb41b…

MALICIOUS

PDF

73.2 KB Created: 2021-03-09 01:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: af7ffc55e925bba52fd58c7c39fde11f SHA-1: 7b663a971b6cd25e77737412573b7d95c3064551 SHA-256: 4546689348acb41beb06b779c26b9d73c6b1234391d66b6fab893d3db19ca22d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting domains and are disguised with UTM parameters suggesting a lure for popular games. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=five+nights+at+freddy%2527s+game+unblocked+4 PDF link annotation
    • http://epipog.com/ejemplo_de_monografia_en_wordiisu6.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/iz7jcJJ/76230657786.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/f55271e8.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/raxakolugudulefuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_6029566daa3ea.pdfIn PDF document text
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/jumibidumikanaluxapi.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/iaEjbii/61915310241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_6027f6cbc2ad4.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hgkalnQ/buvimukized.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/bovoriwuboxelodedibup.pdfIn PDF document text
    • https://bazeneta.weebly.com/uploads/1/3/0/8/130813787/9625193.pdfIn PDF document text
    • http://muzoc.xyz/10301617046nc4v6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukokovevaz.atwebpages.com/bmlt_syllabus_2020.pdfIn PDF document text
    • http://nutenumiguvivek.rf.gd/turitifemelujalagif.pdfIn PDF document text
    • http://visunizuze.epizy.com/ejemplos_de_reacciones_de_combustion_en_la_vida_cotidiana.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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 5880 bytes
SHA-256: d1977f8feaa0e1b1fcf38cd4fcea2fa3f78861ece5cba4551fca35c2a78d24da
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10428 bytes
SHA-256: f82414bfc05fc052ddbff24b6658157c671162ee0e3ead0bf524b138b9ae6767

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