Malicious PDF — malware analysis report

Static analysis result for SHA-256 666c78b0e331a049…

MALICIOUS

PDF

77.8 KB Created: 2021-05-02 06:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8038b952a92a25cd241eb298953bac23 SHA-1: 7dd171aad614b71cebdb4b717e836e5cd89628e9 SHA-256: 666c78b0e331a04999e898e939bc63d14cb6aa33b4fe15863a834500ba23183a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one primary URL, 'https://gimoguvi.ru/strik?utm_term=aitor+jungle+king+1+survival+knife', is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm for SEO manipulation or to obscure malicious destinations. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via the suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=aitor+jungle+king+1+survival+knife
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fe23d86f31b0.pdf
    • http://oneitshop.pro/general_anaesthesia_procedure8rd8k.pdf
    • http://tpdreport.com/char_broil_tru_infrared_electric_grill_partsxyzb6.pdf
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fca4bf8105ef.pdf
    • http://detonic-italia.website/vermintide_2_battle_wizard_buildwetvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudefem/icse_2019_biology_question_paper.pdf
    • https://s3.amazonaws.com/bufexa/27613950915.pdf
    • https://s3.amazonaws.com/xutomoxu/fuzexak.pdf
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_1935828439024ccc97e46fc7275b7148.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_9fe947ab73a947378c5765c6b6a6537e.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/gomin.pdf
    • https://s3.amazonaws.com/fixararololu/lediwaxoborifejuxemewawu.pdf
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_46f6790639c54e8cacd0d3c8e063786d.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/45383696879.pdf
    • https://s3.amazonaws.com/zubuwujoxom/californication_bass_tab.pdf
    • https://s3.amazonaws.com/wobuzisibal/forensic_science_deductive_reasoning_activity_answers.pdf
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_70eee70dc8294af691ac4a4a5cebe7cc.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_2e727fcd71714b3bbc372e592e687bda.pdf?index=true
    • https://s3.amazonaws.com/zakunafu/bepetupiworisedabela.pdf
    • https://s3.amazonaws.com/semuxemakaw/power_of_information_technology.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_off0000ee38.bin
5acaaf9271fbf8c014e1d0a3b03917feabdf9363fc11b93dd2392f8c15102678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 5176 bytes
font_01_sfnt_off0000fffc.bin
48bedd0389424b3c36b8a073bc1a0aa063cf4a5d2665cd2e3e1f7e8c0debdfaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 12240 bytes

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