Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cfb70d884c9642…

MALICIOUS

PDF

74.7 KB Created: 2021-03-01 07:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf38390cb6d62afbf47e10b2784f4b30 SHA-1: b67f35ea2ede7dc81b7804f23b2f1b9fa6dbbd90 SHA-256: 87cfb70d884c9642d25bb6c8babdf2f6ee5aba833bbd09228724edbe8e146a96
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains multiple embedded URLs, including one that appears to be a link farm on disposable hosting, and another that is part of a search query lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf, suggesting it was generated programmatically to appear as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=what+does+jim+symbolize+in+the+glass+menagerie PDF link annotation
    • http://vittorguxx.site/large_numbers_worksheet_for_class_5cgb55.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/what_can_i_use_if_i_lost_my_treadmill_key9net7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_6020bc51ca54b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_6007b5835ceef.pdfIn PDF document text
    • http://rexidoguvigibux.22web.org/91148553922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_5fd18e4626fbc.pdfIn PDF document text
    • http://agentsecure.space/62346132271zpsks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5ff634fbb2ad6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojevawe.epizy.com/calculating_averages_from_frequency_tables_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/hindu_religious_books_in_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/free_ebook_template_for_openoffice.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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 5620 bytes
SHA-256: ed82d0011c56f74e58c171be9465930ed5a181dacb3fa8cf2c019801b2737d04
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10260 bytes
SHA-256: 0683ffad1e532aa91512e00ca009fc8b6ccecd14c61bd469ffd60af9b18eef9c

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