Malicious PDF — malware analysis report

Static analysis result for SHA-256 01545bdfb9dd6754…

MALICIOUS

PDF

79.9 KB Created: 2021-09-26 21:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6658c35f4643713ee16d0c551d1dcc5f SHA-1: c5c9b20b47cb466c6990238822dcf5525985f5d8 SHA-256: 01545bdfb9dd6754b9b6ba8b7d2d9753a71dfb4ef75f816791639f8c3471fffa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=conquian+estados+unidos PDF link annotation
    • http://portaldo.eu/contenuti/upload/file/97918860190.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36882503049.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/dodapawugirezilasutomu.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/9965879649.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210915/file/35590458437.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lorojujazubugawekenibe.pdfIn PDF document text
    • http://aurora-c.jp/files/files/44875458858.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/56353198051.pdfIn PDF document text
    • http://carbonelite.ru/file/zimukenarewu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/mamigiliva.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/81701427180.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/jizukizobotuge.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/sokakeduwud.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/65158666070.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/73122820992.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/db1f1e8c3e42a551f30e9161ee2adbfd/65410095159.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/lobizetawexagukokub.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/sedab.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/97559477796.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613134dbb9a2b---29961125598.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/juzilanabutu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/5379079869.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/likubefutivu.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/98749031281.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/wugakuxagilukupaw.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://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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 10372 bytes
SHA-256: c6eae017b408ede58e0fd10f63df6464a9fc715b5b0b4313b7c97f4f3a1b4d6b
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 21768 bytes
SHA-256: e830ed7ca71c172dfc66bcc6cd257cdbe464fe9bbfa9e926fd88fd6647b753db