Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3d03649fab8ede…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 14:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 019db54c677167b712179d0354353531 SHA-1: 503ff9f403cdadde9cf0dd9c6ee9c559a42c0dda SHA-256: 4f3d03649fab8eded33d5777448a04b729fbb222a672ab20b27a3a1c4c499afd
126 Risk Score

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-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/strik?utm_term=history+of+philosophy+without+any+gaps+youtube PDF link annotation
    • http://mestikon.online/how_to_audition_for_percy_jackson_disney_plusuaw39.pdfIn PDF document text
    • http://naturka.space/sorokanori02is.pdfIn PDF document text
    • http://adminhalil.com/95319703711ztz33.pdfIn PDF document text
    • http://slimitalia.space/8387119125al1cw.pdfIn PDF document text
    • http://rusherx.studio/free_rp_generator_no_surveygwxrd.pdfIn PDF document text
    • http://egrn-order.online/navy_seal_museum_virginia_beach0dgmn.pdfIn PDF document text
    • http://soldonlittleton.com/how_to_replace_agitator_on_maytag_centennial_washer749qi.pdfIn PDF document text
    • https://gafajabi.weebly.com/uploads/1/3/4/8/134880466/9280313.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/xapujajopabobiwixipuxig.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/e1mttib/muzusokenelawadifuz.pdfIn PDF document text
    • https://bofubesal.weebly.com/uploads/1/3/5/9/135958810/ligozowitatolavorale.pdfIn PDF document text
    • http://otomail.business/110286146683x89t.pdfIn PDF document text
    • http://noverst.xyz/95646997636d9yir.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/2ktnhcv/63631603383.pdfIn PDF document text
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/tomel.pdfIn PDF document text
    • http://ewop.space/how_to_use_the_light_meter41nfx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/nifexajuziko.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_074236b300d948aa855c5ee04cf3492e.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_a42e68c66607457b9c6a65cdd7b4c184.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_86b1d646860b40cca79e9f06c06a7e4e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 5456 bytes
SHA-256: 9f2178f29abb509fc077ec703f6f8c37a8d83ee92b8f6b1003a51a82f5eb6fbe
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 11360 bytes
SHA-256: f3f551b13885be943261f0ea387b57076363e1e25902f46b316f231df8e4cb50
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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