Malicious PDF — malware analysis report

Static analysis result for SHA-256 557236138b4eea71…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 21:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e9db9a8fbf5c4e849264da9540e3f05b SHA-1: 2225ceef55dccdb39609a7bc275da06597368961 SHA-256: 557236138b4eea71ce9528757d361ddbd5c1fa655d2dd1891a6438f0603887c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cd9c99543d11528df72c8645e9a6ab33/12603915278.pdf In PDF document text
    • http://garagehayashi.com/js/upload/files/24528436658.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6eabfb1bb2f9879e0f278e5a4af9c4f/92608757615.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/43685118368.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/12947048292.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kevaluwib.pdfIn PDF document text
    • http://boldogelet.hu/media/ravofag.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/gorazomuxadaxib.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/gevesovagepodiru.pdfIn PDF document text
    • http://detectiveoffice.net/userfiles/file/lenabumopubazonefujakuv.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/timitupe.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/migufemitoxixuzax.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/ribaduwepasuvujado.pdfIn PDF document text
    • https://mcsfood.com/images/file/35505836855.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/giworogajolavevume.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/kawinubujirivud.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904195227.pdfIn PDF document text
    • https://angem.fr/userfiles/file/pakezovuxolevulusilituje.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/noxiwubu.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/99994698438.pdfIn PDF document text
    • https://ancoraeducacion.com/images/99686833005.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gewuxaxaneda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+win+friends+and+influence+people+file+pdfPDF 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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 17656 bytes
SHA-256: c7f33120f8264b7a5a01dbccb0982f1cab12b8ff557b74bf8b338869e0dc0ed5
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 10792 bytes
SHA-256: b32dbd19fb2ce2e2272b21a7076f72c9a82fb7b497d7bda898ee4755a9acd37c

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