Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5891dd57eca8fc2…

MALICIOUS

PDF

74.3 KB Created: 2021-10-05 08:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b359d2d0cef2bb0d5c5abd1efe96544f SHA-1: fd1afbcf66335bc056a823ea402a66467f84b440 SHA-256: c5891dd57eca8fc246c322090eccf19f784bc2c8d574a7ebb8cc1c3bf84324be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://speeddating.lt/speeddating/ckfinder/userfiles/files/14725262595.pdf In PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/zikesef.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-30/20210930170525751464.pdfIn PDF document text
    • http://coolscape.info/images/files/tepekirubekad.pdfIn PDF document text
    • http://sogelec-eng.com/files/ckfinder/files/libomodazatodegivexizivuz.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/bigeroxunabadawofagates.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/73959207701.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/suparajemolizevebiv.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/43500356851.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/pesebaposujikadovozobi.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/2241420072.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/goxit.pdfIn PDF document text
    • http://domexpo.ru/up/file/tatugudevabeduxudafesini.pdfIn PDF document text
    • http://x-mobio.com/upload/files/supiriditutifu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/30d65b8d04a7aed95f557182bb3dd2c4/32676459259.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/robofujipesovowupubazida.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/navapikufuwum.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/78740225361.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911063733370.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/tiribitodiforo.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/fetopumekarowar.pdfIn PDF document text
    • http://hadt.vn/upload/files/ruraguroxekazo.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tesevewewovaxered.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/35946786801.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vefutasovexunel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bachelor+of+science+in+business+administrationPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC281 11032 bytes
SHA-256: 8f3af6027e1aa104fd73780e7c2d9d8596a1aa517cebafbc7b0c1d216d08397f
font_01_sfnt_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 15672 bytes
SHA-256: 748b3ab68770dbc1e6ebd012ac64110375e80eac58aeb5a8f0da5d12c9c7bcff
font_02_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1