Malicious PDF — malware analysis report

Static analysis result for SHA-256 7828afb2aafaf3b7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 14:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fba8d704d4f4e59823ae66363943caa8 SHA-1: 74016bad2c25fff575c3965cf5dd02ce16104c79 SHA-256: 7828afb2aafaf3b753e09118fb09975ecd00107887ac9ac384bb780de701c4af
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a URL pointing to 'botokaw.ru' with a keyword related to financial statements suggests a lure to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=balance+sheet+and+income+statement+of+a+company+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415531/normal_6058059bed574.pdfIn PDF document text
    • http://8bitbeardsco.com/kavonalidaxetagarokumatujhjwq9.pdfIn PDF document text
    • http://gomotejux.iblogger.org/90596507595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fd160ae0c9a7.pdfIn PDF document text
    • http://jezolagewe.iblogger.org/filehippo_app_manager_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451228/normal_600326c878a18.pdfIn PDF document text
    • http://ru-en.xyz/gadolowokuvidupuseludosufelg2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600e68638c347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485813/normal_600fc36fb13c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://melewurimepuja.rf.gd/kujuginudaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/lazosadelamukajufeteta.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/devif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103bf9fb-a9dc-4bd8-acbe-4f91270a4b24/el_pequeo_vampiro_resumen.pdfIn PDF document text
    • http://xopizoxixinida.rf.gd/bukuzolugadavuma.pdfIn PDF document text
    • http://xojukoliw.epizy.com/97845009854.pdfIn PDF document text
    • http://fesusate.rf.gd/performance_porsche_carrera_gt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2ab46d-0275-480e-8e99-0a40e863ba0b/rebiseze.pdfIn PDF document text
    • http://gajovab.epizy.com/lifisofaju.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5452 bytes
SHA-256: 8b5177a6d486270312bf60e5f4688b709d5b6f12f497e8bafac321d503f9bf86
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 11756 bytes
SHA-256: 73577d191c0a5ed566d70b7bfed1ca3869a502716b9c044f7a542947b8c84873

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