Malicious PDF — malware analysis report

Static analysis result for SHA-256 80263f3b92920de5…

MALICIOUS

PDF

78.9 KB Created: 2021-06-03 15:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 92a354acd2b039f446c47bae475d36d5 SHA-1: ef00bb064f3f27c464c1201ce6ffc1b23245be97 SHA-256: 80263f3b92920de5f2af92d4de4ad78691d24f6044f014dafd3a404b7b8bfc7b
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 0.9996

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://zajinet.ru/123?utm_term=school+leave+application+format+in+gujarati PDF link annotation
    • https://vujoxakot.weebly.com/uploads/1/3/4/3/134318531/65d3894b7.pdfIn PDF document text
    • https://foxekefiki.weebly.com/uploads/1/3/4/6/134666392/1100501.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/01283ad21ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_60392a67e6ede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5fc794f416576.pdfIn PDF document text
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/8655992.pdfIn PDF document text
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/5d168113a180bd.pdfIn PDF document text
    • https://wenozujilemufo.weebly.com/uploads/1/3/4/4/134456287/kikiwevobe.pdfIn PDF document text
    • https://zufuvedowenekoz.weebly.com/uploads/1/3/4/8/134861022/8de9e517.pdfIn PDF document text
    • https://solovetimu.weebly.com/uploads/1/3/4/8/134879252/fabb1a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fc6cf3c1e373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0239890-fec2-4d57-beef-8b79af0d013f/7603841683.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425484/mymathlab_college_algebra_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f742c5c-6b5c-4438-b46b-ccc003d41813/libros_de_economia_y_politica_de_mexico.pdfIn PDF document text
    • http://barumena.pbworks.com/f/coloring_pages_for_preschoolers_printable.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144422337/how_to_pass_the_bcba_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424664ff-abf9-45b7-9d0f-88cb455131ba/counter_strike_1.6_uma_hilesi.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144514317/rcc_column_design_excel_sheets_as_per_is_456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dde280-c0e3-4187-ad90-54b411666db0/19814230306.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144449073/63690601292.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144543576/luwukuwozeniko.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_off0000f6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 5488 bytes
SHA-256: 1119b74a71339e4c0fc2f868e3f0af59e6f14e4a11f80ca018c2ea3f029d35f4
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 10652 bytes
SHA-256: 54c13faacea540c6320fb28eb549ec8fadde36765a892d21bf6ff2939ac58728

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