Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b59375b9c8dfc4a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-01 13:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1b128f5d1b66a91d360913d4c87d1ed SHA-1: e1dcafc36e21a918dbcf85171ffcb0b4a36c5320 SHA-256: 0b59375b9c8dfc4ae822ddbb1c95ce180b6a44950ac29b3301ed43bff58d968a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+size+bag+for+airline+liquids PDF link annotation
    • http://trackcreditscore.info/windows_10_free_with_product_keymo0i3.pdfIn PDF document text
    • http://siondez.ru/58763664913ctcev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413968/normal_6005d5de61c68.pdfIn PDF document text
    • http://it50discount.pro/75107210054funer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5ffadf1aa4ed7.pdfIn PDF document text
    • http://mobevusujezuno.22web.org/simple_english_grammar_book_free.pdfIn PDF document text
    • http://pitushok.space/29078028612gq6qt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_6030616fd746a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_602bb4cb01e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_601ddd6a58e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2dafa3223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5fe3a86f0ff5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/how_much_does_a_rebuilt_transmission_cost_at_aamco.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/95107049297.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/s2_netbox_extreme_default_login.pdfIn PDF document text
    • http://binawojojin.epizy.com/use_of_benzene_in_our_daily_life.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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5496 bytes
SHA-256: 22fe3199d16f52ee2bf1d59f4566c810b8018d3bd883712743ded2dd8ee4995f
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10800 bytes
SHA-256: 2a414d6fb9bc0afe511bbae4e73b4d84cf2e7f5498e2badee214d51042233474

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