Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ddbb5495c8cfea…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 14:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3da44c21721c5c311b25ccd0b1df0bd SHA-1: 24e4e524f699a652c6f4e1ed61f3e36c2ab9a9d3 SHA-256: b4ddbb5495c8cfea8858dd3a66107819f1d1812dde500e94aa5c5ba8bbe8e393
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, and a specific malicious URL 'https://mezovuduw.ru/strik?utm_term=when+was+garmin+945+release' was extracted. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further payloads via the linked sites. No scripts were extracted, but the structure suggests a malicious document intended to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=when+was+garmin+945+release
    • https://cdn-cms.f-static.net/uploads/4458848/normal_6037fea9b24fc.pdf
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fe6ce841c5eb.pdf
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe27317006be.pdf
    • http://copyrightsafetyhelps.com/connotations_worksheets_free9307n.pdf
    • https://cdn-cms.f-static.net/uploads/4457868/normal_60255ef43d0b6.pdf
    • https://cdn-cms.f-static.net/uploads/4384480/normal_606045eb20397.pdf
    • http://napowojeba.medianewsonline.com/mary_poppins_returns_lin_manuel_miranda_music.pdf
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fd7cff0b87ff.pdf
    • http://zofunubesosena.mypressonline.com/37661844423.pdf
    • http://uptodate.site/think_of_me_phantom_of_the_opera_chords11nzv.pdf
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5fe7da9e077a8.pdf
    • http://sweetmeet.online/how_did_brown_v_board_of_education_change_societyqtgm1.pdf
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/192c3a76c91.pdf
    • http://de-bewertung-889562.icu/what_is_the_surface_area_formula_of_half_a_cylinderpnnvh.pdf
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5fe17ee4d9c92.pdf
    • http://strahuemsya.info/how_much_does_a_ford_escape_hybrid_battery_costtnsa6.pdf
    • https://cdn-cms.f-static.net/uploads/4495976/normal_604f59bf7b6c9.pdf
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5fdac7841aed9.pdf
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fe1356da16e1.pdf
    • https://fisusaweku.weebly.com/uploads/1/3/1/8/131857315/vixabujebedo_nuwuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zilowovuv.atwebpages.com/fenefifakikutix.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_off0000ec3a.bin
e7878f9e0428f40710dc7d9d6c54063456edc5813a2b2418b761c3dff658f427		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 5572 bytes
font_01_sfnt_off0000ff20.bin
ecfd14975e1583767fcd2868b59bb8f55046152599bb2d4123fa1a6918061d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 10804 bytes

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