Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4d382f5f99a8b9…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 09:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5797c73f5e1114b0b1249ad3b07b27f1 SHA-1: b0fd65e1a971c36cb636e1f06a411d652a2b43b5 SHA-256: aa4d382f5f99a8b96825a01d8c195dac7aeeaad68ee512dbdbe0b33fd2db46cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links to disposable domains, indicating a link farm or phishing attempt. The PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+are+the+4+main+purposes+of+writing PDF link annotation
    • http://hiziryigit.online/cubecraft_report_pageqqp1y.pdfIn PDF document text
    • http://profoto22.ru/64645407389rfry1.pdfIn PDF document text
    • http://nazhivy.net/14237464001fr6s6.pdfIn PDF document text
    • http://mon-cmso.best/what_was_the_us_constitution_written_forxoaak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_605001ca5abfd.pdfIn PDF document text
    • http://wexypay.icu/sejajipur6u2qa.pdfIn PDF document text
    • http://trend-sales.fun/42847513272jnpnc.pdfIn PDF document text
    • http://terem.space/nuvufijefisudarexupoboraty5mzl.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/the_importance_of_being_earnest_film_online_free.pdfIn PDF document text
    • http://shtancircul.site/minn_kota_power_drive_v2_problemswla77.pdfIn PDF document text
    • http://premiumpornclips.com/manual_de_funciones_de_un_vigilante_de_seguridad_privadapjv95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_6018355dd5c8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389101/normal_5feda95262483.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/mapa_bruselas_imprimir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fcf74ab3e603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genukopapovixo/73990709236.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/bivig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 5356 bytes
SHA-256: 1741a3342b541864e033ac2b7e2c598c885100ec2a28645d87ea138c0295f454
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10884 bytes
SHA-256: 9e853f28a76741ae5d525e44d188d9c11d63fda539ea5172e0a9aecbca0906c1
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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