Malicious PDF — malware analysis report

Static analysis result for SHA-256 024e8a2507eea058…

MALICIOUS

PDF

80.9 KB Created: 2021-03-19 03:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feabbd3b5f55ceba8715f62c17bfba9e SHA-1: e3e116f6cc0f6b4dda6cfb0f67e4c35f757ae1e3 SHA-256: 024e8a2507eea0583686b98636e7cab1e24660ab141004368d158a43c58f0548
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to contain search query-like text, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/aws?utm_term=how+much+does+it+cost+to+keep+a+dachshund+uk
    • http://tegor.xyz/leseminosupazozusijag7zwnv.pdf
    • http://rawitotizoxuk.scienceontheweb.net/xuzorosikifiwuz.pdf
    • http://timecodes.net/lasko_fh500_fan__space_heater_combo_tower_42_inch_white0k8ln.pdf
    • http://lazujifoxupa.getenjoyment.net/22254958424.pdf
    • http://dakisemakegag.sportsontheweb.net/xugonidut.pdf
    • http://nutetuxiv.mygamesonline.org/oracle_sql_certification_worth_it.pdf
    • http://vkysnaya-eda.site/can_i_use_a_rug_doctor_to_clean_upholsteryl32ad.pdf
    • http://sokitejosororag.iblogger.org/autoimmunity_kuby.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_bc7ee35ef9394113b2d0b9fa5ccee7bc.pdf?index=true
    • http://gaxilitexu.onlinewebshop.net/tuzazuzode.pdf
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_5654e2065930411ba895933907210bf0.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_dfc1036d220941f691246877ae067d5e.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_7da989aab9944ab3ba14b3c9d30ad44b.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_774a71472cf64bd1a6af7254d0e9c112.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_a8864966e2fd4d319e5e61218f42b36d.pdf?index=true
    • https://s3.amazonaws.com/napejaxosinages/soundhound_for_mac_free.pdf
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_17015d93ee0443699be1b6ffa0969a96.pdf?index=true
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_de3d5f979fbe4a5f9160e17b14845252.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_de2498656ec64e2d9ab1229c343e58b1.pdf?index=true
    • http://fumoparasupob.epizy.com/62733769845.pdf
    • https://s3.amazonaws.com/zafaronivaj/42183300643.pdf
    • http://gelopet.epizy.com/how_much_can_a_3_ton_jack_stand_hold.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_off0000fca0.bin
aa5e8effee62554c444cbfc0659dd2a8edd5afd69a86ecaea5192186e4d324d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 5300 bytes
font_01_sfnt_off00010e94.bin
767614905d5052bd886514794a8d09f0ebf57762d0a9c6c41f429c6abed493d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 11168 bytes

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