Malicious PDF — malware analysis report

Static analysis result for SHA-256 a434332c582bc9a7…

MALICIOUS

PDF

68.6 KB Created: 2020-12-19 02:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 140b4ff4118df8ed795cbaa7a21dde26 SHA-1: 0674af87f556cfec0cf19ecfde0be7532ea3332c SHA-256: a434332c582bc9a73fcc622f41550ff18f3a9bf73ed1fd456f8bec58bffbce1f
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 0.9995

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://trafffi.ru/aws?utm_term=african+american+history+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fd136245843d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5fba1195b7f01.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/384622017e6.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/zupedarabif.pdfIn PDF document text
    • https://basuxebuj.weebly.com/uploads/1/3/1/3/131379820/xabiwofuwusilebiki.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/d81ae333b7.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/lapivarituwi-kedijexedaruka-teledex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc54a5dc30a162e0c6f8caa/t/5fd07ed8125f6a657a4e49f3/1607499480582/59954692864.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cbc6bdb33045eedb2023/t/5fd60841b1c3f31c7a7774fc/1607862338253/free_printable_spelling_worksheets_for_year_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/sitopemofabese.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_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 5748 bytes
SHA-256: 2e4d48e32d4e7d2fc27775fddff5f208395dbae2d4eddd7d2b7554cce56d275c
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10788 bytes
SHA-256: f7b09b63a9e47b4ead4126c17a70f92872976413acd22c97d2909df577368e1d

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