Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a5649e995432d8…

MALICIOUS

PDF

72.2 KB Created: 2021-02-25 22:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e984fd3299ae41ad81d112ac1d494b9 SHA-1: ba7a999a1dd5ad0b7eb9505b381082891f86c58a SHA-256: 19a5649e995432d83e89e2c174ecb5560fea2ce7c4960242df0fb9aec21d5041
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'justify steps solving equations worksheet', suggesting a lure. The presence of numerous external URLs, including one pointing to 'seumenha.ru', indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=justify+steps+solving+equations+worksheet PDF link annotation
    • http://bilabugova.iblogger.org/professional_references_template_google_docs.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/42330636278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419441/normal_5fed1017b4754.pdfIn PDF document text
    • http://choosemadam.site/how_to_start_tai_chi_at_home3u0an.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/thinking_fast_and_slow_audiobook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5fe7efde70782.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/175ef7c275c3768.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/xulaxoza.pdfIn PDF document text
    • http://lasleymarkt.ru/664090312352k687.pdfIn PDF document text
    • http://dayzcommunity.info/wokisipizadewt9agz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_60230e1a63d80.pdfIn PDF document text
    • http://pressit.space/62310316209djrg3.pdfIn PDF document text
    • http://baltika-trans.ru/repujakewcqp7s.pdfIn PDF document text
    • https://gezagijuxeson.weebly.com/uploads/1/3/1/8/131872295/veledefituzul.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/2411964619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwodanodobe.rf.gd/72266509343.pdfIn PDF document text
    • http://dopelafoxumamew.rf.gd/89153493077.pdfIn PDF document text
    • http://sowinoto.epizy.com/air_conditioning_maintenance_checklist_forms.pdfIn PDF document text
    • http://tunakaxawonisov.epizy.com/95343673521.pdfIn PDF document text
    • http://reduxaxu.epizy.com/kannada_voot_app_money.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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 5596 bytes
SHA-256: dc4628b60120356681f80401cdb9358175e1b00abc3f66e70d33757514fb17b0
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 10244 bytes
SHA-256: d0019a353e16d0f5e2a350fd74dbf32bbf2fb10a879f67daf044b0f728aacea2

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