Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04e8ad13823aa90…

MALICIOUS

PDF

78.1 KB Created: 2021-02-19 13:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 804614713c7c8824547f83fb2dfa1412 SHA-1: 111a1d0551ca603e20c00b50c586aff9d0f8d121 SHA-256: a04e8ad13823aa901bbf7cc74ad451213d67e502c28801d289902047dcac021a
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 0.9998

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://druttle.ru/123?utm_term=cisco+wrt160n+firmware+upgrade PDF link annotation
    • http://maska-respirator.com/lepubuteravasarepz68mv.pdfIn PDF document text
    • http://giocodigital.fun/60020245202hjh0c.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/iaoMVhh/cute_wallpaper_for_boys.pdfIn PDF document text
    • http://ketotreno.buzz/83573223453f0xfl.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/7idjgI6/93883336696.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/shjOhjR/81487826135.pdfIn PDF document text
    • http://private-channel.site/13987543108c14rj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_602a038befce2.pdfIn PDF document text
    • http://yogistika.space/951058650716hpnn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_601794d41dda0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fcf17866bacd.pdfIn PDF document text
    • http://pannochki-art.com/the_information_age_time_period5m04h.pdfIn PDF document text
    • http://whitetwo.space/baixar_whatsapp_plus_apk_atualizado_201891a0u.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/gheT4ig/bubble_shooter_4_kostenlos_online_spielen.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/oHTHjgn/fidukilipibobog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490736/normal_5ffae5120c99e.pdfIn PDF document text
    • http://frankkyko.com/viber_backup_iphone_to_androidwhveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/1694668735.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/xiwuxuluwo.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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 5788 bytes
SHA-256: c5f384f373ce0cd05e7048d74092c45d689cc6698028eb8dafc4146693cd9a7c
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11480 bytes
SHA-256: a466b38c7b842aa1a412108136f77af802b0f5a00c13c992fa9fb8bc8500f439

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