Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea306efdacf89fc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-11 14:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 515b999f38f6f8c106dcdc0d4d093e61 SHA-1: ead5e55f32c8d98e29bd326370bf5f228f28514f SHA-256: cea306efdacf89fc4588ce2929abf6a9630da7d0d81b5e6b35ba4542458870fa
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or SEO spam to drive traffic to potentially malicious sites. The primary URL, 'https://vilenefex.ru/wix?keyword=redwall+cookbook+pdf', appears to be a lure for users searching for specific content.

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://vilenefex.ru/wix?keyword=redwall+cookbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff65752485fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495860/normal_5fdcffee18cf2.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/arbeitsschutzgesetz_arbschg.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/is_twilight_ok_for_a_10_year_old.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/24696489462.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/14998681240.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/fenns_2010_autobiography_the_thrill_of_the_chase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_189a96322968423bbb384cd9b7c257dd.pdf?index=trueIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_09d9a1c07cb4446f82592215fc2eb373.pdf?index=trueIn PDF document text
    • http://zejibanunepi.myartsonline.com/tetawekodonitotag.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/keys_for_writers_free.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_58ddfc25c19646fc867837a0bc084332.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_8847922924874ff7a49912829d697a23.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_12262e44ddfd454ca17d76ba2448212b.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_3afbdfc36292425ebeab14637b604060.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_4f7d2cc1bfd04e8dbf489668409b4346.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5176 bytes
SHA-256: 4f8680b5c3b9a3bb2c48c293131f5f8d13d83d5772c5c33ef30b1e90f58c9feb
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10308 bytes
SHA-256: 3afd4818c23cc7e4ae9557c6c68d9bc64a36949f2721ee070f3869cb961347fe

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