Malicious PDF — malware analysis report

Static analysis result for SHA-256 a692546096957c8d…

MALICIOUS

PDF

82.9 KB Created: 2021-03-16 06:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c289aec3432ef0e245391b60cb71b2e SHA-1: 74c5f04ec42d915d85ccc4f6bdf3b31cc6c116a8 SHA-256: a692546096957c8d9a2558df69711d2d76fdca636d1ca64abe7d50566e264f86
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=banana+boat+sport+performance+spray PDF link annotation
    • https://wexisuteki.weebly.com/uploads/1/3/4/6/134616275/wuzevirunuvoxejovama.pdfIn PDF document text
    • https://dutesemo.weebly.com/uploads/1/3/1/6/131606066/tobumojo-ritiwexe-tisomelodexij-ditokewadejixit.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/3805289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_604faf8c26ef4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5ff8536a4cbdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_6016b7d77de7f.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/38024080160.pdfIn PDF document text
    • https://sumikoxivabozo.weebly.com/uploads/1/3/3/9/133997645/4448206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff3372581450.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/xuzexufajezebitabitiri.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/wononudakarezomiwi.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/dineluve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fifoxadubote.rf.gd/verbos_regulares_en_ingles_los_mas_comunes.pdfIn PDF document text
    • http://tuzexom.rf.gd/biblia_de_estudio_plenitud_reina_valera.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_d39499341b0242619bc779e46da58888.pdf?index=trueIn PDF document text
    • http://gumenunusukuk.rf.gd/what_time_do_the_stock_markets_open.pdfIn PDF document text
    • http://peruroz.onlinewebshop.net/79783154003.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_f751ff638e044ab994a9e5d1592a3d46.pdf?index=trueIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_c46132b1a0eb4ea2bc3e2683d9f2de72.pdf?index=trueIn 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_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 5420 bytes
SHA-256: 580bfd61fee6b2389e7c16064399fbc8ed7b962f8659058db849fa8e38684a67
font_01_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 10664 bytes
SHA-256: 3683b65d99ae1e307b27a4a00261b88411f26ae83bab5bda511049e4758cc73d

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