Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db336723dcc9d8c…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 14:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7b4cadbee64dbe530c0ca8d820c27434 SHA-1: 1d62c147d514064183a923ff34656504c0780ed0 SHA-256: 3db336723dcc9d8c98a8a86868d81d4bcb0ddb330f2cbd722a9dc0a5eb87469a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=logitech+k811+unifying+receiver PDF link annotation
    • http://kufemotobenin.66ghz.com/mixulave.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/wixumo.pdfIn PDF document text
    • http://suxawid.iblogger.org/xomez.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/molecular_biology_of_the_gene_questions_and_answers.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/partituras_de_canciones_cristianas_en_piano.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/kuzigirabuvukeli.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/24687166649.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/10209773403.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/zuganomodujovaxijeto.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/how_to_configure_samsung_dvr_for_remote_viewing.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
    • http://petojijoxura.onlinewebshop.net/spring_framework_guru_swagger.pdfIn PDF document text
    • http://kibeboxonu.rf.gd/wabiraroxepududujede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdc441d-fd57-42f3-a1c6-4ddb3308e9d6/gubigabig.pdfIn PDF document text
    • http://mojokefav.epizy.com/gekemoxixinuxi.pdfIn PDF document text
    • http://zelalosiker.rf.gd/nosocomial_pneumonia_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/xitidagujofulajiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af9fa43-f7c8-489c-9295-299dc207f7fc/96888960902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ce8325-df51-4dc6-930c-5b9bbfc68abd/4962115738.pdfIn PDF document text
    • http://nufufud.epizy.com/vaastav_full_song_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bifiluzakiwomijifedidok.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/bls_provider_manual_aha.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/zorenudezonenudejaget.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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 5016 bytes
SHA-256: 12b855ce869d6b300c2c39e5cf88036074c57cea08adfa536de86956dd83365b
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 21156 bytes
SHA-256: 56728fbfa402aa6377643905861783cc6acf1d3a6aa3d6de9d17fada3067eb46
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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