Malicious PDF — malware analysis report

Static analysis result for SHA-256 54666c27a197bb86…

MALICIOUS

PDF

72.3 KB Created: 2021-06-08 12:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08b4f8c5396ae7a291fcf9422f9ff1c8 SHA-1: 967eae62d3d54ef5d1b0ad25316cb276052b5437 SHA-256: 54666c27a197bb86a8ace55ca5ea2702caf9880890d818fe1c9ec80ffb075e29
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://philabc.ru/pbw?utm_term=ejemplo+de+un+ensayo+argumentativo+y+sus+partes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368227/normal_5fcfe89f57296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_604860786e560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_606d8e06cd5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_601c9b6fe10e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fe17f6e93ee9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5feb5d0e8430b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_606a8e7ce9252.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/fa2dbcb6bf9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_60bae71b73368.pdfIn PDF document text
    • https://xafadatez.weebly.com/uploads/1/3/4/4/134478609/wosagukub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5ff81be134ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_605fb5ded4a91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcd94a7e26c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602f0beea1f88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5ff593b3d1704.pdfIn PDF document text
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/0101d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6013b22805e61.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/vidanunubamanikib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorunezagu.pbworks.com/f/dont_mess_with_zohan_movie_download_in_hindi_480p.pdfIn PDF document text
    • http://sakulibur.pbworks.com/w/file/fetch/144628185/how_to_get_x_in_an_isosceles_triangle.pdfIn PDF document text
    • http://rutarotovez.pbworks.com/w/file/fetch/144766026/how_to_write_a_statement_of_intent_for_masters_application.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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 5472 bytes
SHA-256: f57b6f5b52b0a21c030a4d0e4e3bf1c49678d48669534b380c44fcf85900e1f4
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10752 bytes
SHA-256: a4574921651c81a27a4c2cca09f21aff394c0a10ce1cbab50a2091833b521031

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