Malicious PDF — malware analysis report

Static analysis result for SHA-256 4821bc7c242fb8c2…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 12:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500cde69303b0b2b4b255fd5067b133b SHA-1: ec94001906a1199c288121e1fb142de7b2d88d5b SHA-256: 4821bc7c242fb8c20661258010562c3abbc23cc306ee7e3e99ca2e8034436962
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://vilenefex.ru/strik?utm_term=their+eyes+were+watching+god+chapter+5-6+summary', is flagged as an external URI and is likely the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=their+eyes+were+watching+god+chapter+5-6+summary
    • http://b4shop.icu/how_to_reference_a_book_in_an_essay_exampleswp4al.pdf
    • http://tricitysikhs.com/3942297502jwuef.pdf
    • https://lorebanoga.weebly.com/uploads/1/3/0/7/130738704/fepake.pdf
    • http://rosativiwam.mypressonline.com/roloxasexu.pdf
    • http://medyahanem.com/dirt_bike_racing_unblocked_gameste77c.pdf
    • http://streamsweets.com/fupafosiduveddx7y.pdf
    • http://paselon.getenjoyment.net/ullman_introduction_to_automata_theory_languages_and_computation.pdf
    • https://likemopulijufo.weebly.com/uploads/1/3/0/7/130739197/dexidatifugol.pdf
    • http://alania365.ru/semaxijiguir380.pdf
    • http://cleaner360.shop/janegupowumapedenafowarotrdlm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/galinikagopit/where_can_i_donate_old_prom_dresses.pdf
    • https://uploads.strikinglycdn.com/files/cf241441-51fb-4b4e-99bf-3a1cb924b772/bogadewigusapa.pdf
    • https://uploads.strikinglycdn.com/files/63d55a0f-e280-4f61-afac-03439b995a93/list_of_irregular_verbs_with_romanian_translation.pdf
    • https://uploads.strikinglycdn.com/files/e0b4d624-7dfd-4a5c-bd0f-e37deda3056b/1632562575.pdf
    • https://s3.amazonaws.com/perurulexi/dewaviragegomadapuf.pdf
    • https://s3.amazonaws.com/bepukuba/bowatugu.pdf
    • https://uploads.strikinglycdn.com/files/c3c009b8-a9a9-45e7-868c-597132983645/38629724409.pdf
    • https://s3.amazonaws.com/woberiz/annual_report_of_wipro_2018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010081.bin
40362da186c72ab25d988c9a5925f8ecf9c66e1f2feb390a34befc54b793f942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 5908 bytes
font_01_sfnt_off0001149b.bin
d0f0700293d61c47e4ee6790e4f0c4b1ffd501cde2ebbbd68994e499de8c00b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 10184 bytes

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