Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e91b53c4b6f03c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 21:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a795500b19db5b58d39b777b3194290 SHA-1: ae32cdcb878fb1cbe4a37515c568d10abea74f9a SHA-256: d6e91b53c4b6f03cc65d971f66978c3311fafa1dade9c955bfd80040f4f08d6f
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users into downloading further payloads or submitting sensitive information.

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://garglob.ru/uplcv?utm_term=corvus+redmi+note+7+pro PDF link annotation
    • https://calson.garment-pro.com/ckfinder/userfiles/files/jofonabonazarotinununis.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/ramobijugifotaruvefubi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161304fe32bd6b---78923369681.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/lalorematituxupazevik.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/nokaxozokumejudevogijinel.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/mavuno.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/zunimapunekavonog.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xamolu.pdfIn PDF document text
    • http://paradoxine.com/upload/files/tedozobuxare.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/23415554925.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jusapexujudesofuzite.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/rololek.pdfIn PDF document text
    • http://th-hl.com///upload/files/7875877894.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/58534391223.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wafugalobogotexurip.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/88765542682.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mexulowu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aebe0de24---tirodisosiwuguwatuxud.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/futedezovatulokazexe.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/wudotabaloguxuf.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xebupalirejozituxufu.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/wamibuli.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/kedinirixigedoverajo.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-13/images/files/39791526976.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_off0000b850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 10592 bytes
SHA-256: 1b2aac7d3f74049a5c8a688175e3625ffaa7028672195ed212f1bed304d7ad45
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 15008 bytes
SHA-256: 25e16609722b3490bfbff9133e021a52b9903027a5bf5ec64081b32d87068584
font_02_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1