Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b4141d83d75482…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 08:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69fabd05595d3ecf484e125f53fe4414 SHA-1: 9aba83f8926496b7f7b4c248a6d10fe7d9c9c615 SHA-256: e5b4141d83d754824933d49d85e54a0d324f6cfdfc1493d822700aa965dbb38e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update, a common social-engineering tactic. The presence of numerous external links, including one to 'botokaw.ru', suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards exploitation for client execution, likely involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/wix?keyword=pixel+gun+3d+cheat+online+dating
    • https://cdn-cms.f-static.net/uploads/4409610/normal_6046c9e8c05b9.pdf
    • https://cdn-cms.f-static.net/uploads/4457279/normal_603bdfa9eaaee.pdf
    • https://cdn-cms.f-static.net/uploads/4383791/normal_6026fe5350459.pdf
    • https://cdn-cms.f-static.net/uploads/4408863/normal_602f445e0d95c.pdf
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/segodigi-megabijuki-sobasop-fetiziriwi.pdf
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fc70ea97f52a.pdf
    • https://cdn-cms.f-static.net/uploads/4406806/normal_600ff2b32bddc.pdf
    • https://zujododa.weebly.com/uploads/1/3/4/6/134652654/e669c44ecbf819c.pdf
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fc7bbc6992f3.pdf
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/237979.pdf
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff598ae62c08.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66e2f7ea5c.pdf
    • http://tajuliwelofiti.medianewsonline.com/tuvebam.pdf
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fd1023e0edb1.pdf
    • http://xolokukifimiv.sportsontheweb.net/mackie_srm350_price.pdf
    • https://loxugajasogilo.weebly.com/uploads/1/3/4/4/134476701/5a4faf8ecf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tufujifinobiro/56411298644.pdf
    • https://s3.amazonaws.com/nedijowewoded/candy_crush_saga_mod_apk_unlimited_lives.pdf
    • https://s3.amazonaws.com/banula/algebra_1_unit_5_test_review.pdf
    • https://s3.amazonaws.com/wujapu/mdu_date_sheet_reappear_2018-_19.pdf
    • http://nosigegu.onlinewebshop.net/mini_dachshund_for_sale_naples_fl.pdf
    • https://s3.amazonaws.com/bulalowisu/63826980343.pdf
    • https://s3.amazonaws.com/guvovigo/76806874779.pdf
    • https://s3.amazonaws.com/vatosolikijike/broadcast_tv_guide_phoenix_az.pdf
    • http://zatuvejamubolo.atwebpages.com/38872427388.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_off00010bff.bin
597dd8fbc36ddc58630277df62de4944f3a734b74aae2b646ffe89524f59f64d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 5160 bytes
font_01_sfnt_off00011d94.bin
2bc2ed8760df06055033eaac34d21af9cfffcf30fee980d1c380a7a651e7d947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 11132 bytes

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