Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4f3988e66e545f…

MALICIOUS

PDF

95.8 KB Created: 2021-03-24 00:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3a8af90b0a0972f1e21b1301dcb69e SHA-1: 96e24c0ad9ec095cf490e870730e27ac017a4c43 SHA-256: 7c4f3988e66e545fa28f04bc7ff8e02cf60e67af9ed228362b86ba6e42f54ee4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://kuzutuzo.ru/wix?keyword=how+does+the+muscular+system+work+with+other+systems+in+the+body+for+ensure+survival'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external links, suggests a malicious intent to direct users to a potentially harmful site. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution.

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://kuzutuzo.ru/wix?keyword=how+does+the+muscular+system+work+with+other+systems+in+the+body+for+ensure+survival
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/xupiwelelugexazab.pdf
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/7671295.pdf
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/3c5b2bdb137.pdf
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/0db2489e0f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pevarijidasalop/rupaduxuwidokukame.pdf
    • http://wibutena.rf.gd/96609202907.pdf
    • http://lajinijes.rf.gd/62611974686.pdf
    • http://xavisijividefo.epizy.com/benexewowipos.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_57c788606981425ca87a3187a01c68b9.pdf?index=true
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_13fdf448dde643a0ab0d63e630cb14ff.pdf?index=true
    • http://jetuloloz.epizy.com/how_to_become_a_good_team_player.pdf
    • http://bagibuboje.rf.gd/sibitavivepagawonesamobu.pdf
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_48811b8efecb41a8922bf0061a83e764.pdf?index=true
    • https://s3.amazonaws.com/vebisop/optiplex_760_upgrade_ram.pdf
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_8095dd6dac694eaabe3b029ca6de4daf.pdf?index=true
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_86ee37025f894a51a50d97272c2348e7.pdf?index=true
    • http://zixupav.rf.gd/bolens_lawn_tractor_bagger.pdf
    • http://jeduxotikeg.rf.gd/rufezudexuwekog.pdf
    • http://zixadadafupeg.epizy.com/dragon_age_asunder_epub.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_off0001395b.bin
c76801dbf8e48756b0c7d7acefa0bf400def492ce8cc162ab219faae4ad4a4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 5680 bytes
font_01_sfnt_off00014c9d.bin
74b93d22a5dc5c850c2bdd018d254ece0622683d0163d3bb982c121e9484f97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9D 10840 bytes

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