Malicious PDF — malware analysis report

Static analysis result for SHA-256 821121e157809f8a…

MALICIOUS

PDF

93.7 KB Created: 2021-03-30 13:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c322e53c02a2d4158524bc2c530e9d SHA-1: 17acf591ecf7685fb3a157b21eb556d48241326d SHA-256: 821121e157809f8abd3f0d449346e9e7372c393faa1e4ed7a9e40d0d76778ef8
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains a large number of external links, suggesting a link farm designed to attract users searching for specific content, such as survival guides. The primary URL, https://seumenha.ru/strik?utm_term=100+deadly+skills+survival+pdf+download, is likely part of this lure, aiming to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://seumenha.ru/strik?utm_term=100+deadly+skills+survival+pdf+download
    • https://static.s123-cdn-static.com/uploads/4369769/normal_6007c1f6da5d2.pdf
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/nasuvunojuvi_jisuje.pdf
    • https://cdn-cms.f-static.net/uploads/4465719/normal_60623073c3d57.pdf
    • http://lapegokexixij.medianewsonline.com/tibadalad.pdf
    • http://felagem.getenjoyment.net/wigimusoje.pdf
    • http://gajonedorebuko.mywebcommunity.org/wonilosinujofevafamejijuj.pdf
    • http://robertferrell.net/maytag_maxima_steam_washer_troubleshooting8vy7y.pdf
    • http://zalavsky.ru/biology_letters_formatinorz.pdf
    • https://cdn-cms.f-static.net/uploads/4425768/normal_6043f87e37ac1.pdf
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/fotuwi_sizidajuj_meguwone_xekup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gumagabu/59268580448.pdf
    • https://s3.amazonaws.com/rizijubovapuk/how_much_does_ups_express_mail_cost.pdf
    • https://s3.amazonaws.com/tesodagiwor/baraperasilibazezafi.pdf
    • https://s3.amazonaws.com/vabedafozo/juvepajufunetetemujuwa.pdf
    • https://s3.amazonaws.com/xalasawu/aulad_ke_dushman_film_song.pdf
    • http://solugivewatewa.myartsonline.com/business_administration_and_management_download.pdf
    • https://s3.amazonaws.com/muvevanepen/free_birthday_flyer_templates_psd.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_off00012db4.bin
bae479c38f75c845b69f3340952c9278778f3d69a9f6b400c227c7a568e45452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 5452 bytes
font_01_sfnt_off0001406e.bin
dd2fb0891439ab1086f8770d353b2e341767d5118efc60f46db46fe541657966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1406E 11940 bytes

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