Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7ee94ebfe289e4…

MALICIOUS

PDF

104.8 KB Created: 2021-03-23 13:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a7316974172d2a184c62ec09de5b727 SHA-1: 8966f83965c31e23d8cc9e8b030da281fa29e9fd SHA-256: ed7ee94ebfe289e44217f855b106840d818619bf90b0ebf88c8fb2f4899fbed2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent by identifying the PDF as a link farm on disposable hosting. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vilenefex.ru/123?utm_term=person+centred+approach+in+social+work+pdf
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fed90e19c724.pdf
    • https://bupebilonozopi.weebly.com/uploads/1/3/4/8/134861312/8796503.pdf
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5fdd6ba655380.pdf
    • https://cdn-cms.f-static.net/uploads/4456377/normal_6043454fb99c7.pdf
    • http://benivosefemiza.medianewsonline.com/52588376278.pdf
    • http://xapefefulonexir.22web.org/35543089229.pdf
    • https://cdn-cms.f-static.net/uploads/4469841/normal_6038808a416b7.pdf
    • http://daxavepevepa.mypressonline.com/counseling_strategies.pdf
    • http://dejuduz.22web.org/how_to_clean_filter_on_whirlpool_quiet_partner_dishwasher.pdf
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6021bb69af08e.pdf
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/juzoxirebiwug_pexezoximarax_vaxug_xozugub.pdf
    • http://paxijivatebul.getenjoyment.net/a_raisin_in_the_sun_act_3_scene_1_short_summary.pdf
    • https://cdn-cms.f-static.net/uploads/4477637/normal_60280c96b5d8a.pdf
    • https://cdn-cms.f-static.net/uploads/4381752/normal_6050511905d02.pdf
    • https://kisujaxu.weebly.com/uploads/1/3/0/7/130775962/9271437.pdf
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fd344bc9992d.pdf
    • https://static.s123-cdn-static.com/uploads/4379369/normal_60001c9976194.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://butadiviwev.rf.gd/primary_resources_non_chronological_reports.pdf
    • https://s3.amazonaws.com/wefemabeni/crystal_report_free.pdf
    • https://s3.amazonaws.com/zikeko/now_were_stressed_out_lyrics.pdf
    • http://daroxexu.rf.gd/sapipakuxapojivez.pdf
    • https://s3.amazonaws.com/fatikonavori/drug_calculations_examples_questions.pdf
    • http://barajolu.rf.gd/remouse_standard_4.1_license_key.pdf
    • http://bopisumeku.atwebpages.com/15565002540.pdf
    • https://s3.amazonaws.com/visagogijulep/kisamanafup.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_off00015d2c.bin
59bec0c21e62433802197ad6ba4017bf690f6f636261a9ee7d6bfa72cfcec804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2C 5400 bytes
font_01_sfnt_off00016f9a.bin
c37dc2bc72294796652e2c85cf2cccf2a25ccf9ad572ada444ded87bb548519e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9A 10820 bytes

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