Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d62939f0fc3fb3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 00:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf13ee73d7079ffc5b2dc6f5a17a442c SHA-1: f588192f676cc27e72250e11f0ea48de3a057c4d SHA-256: 18d62939f0fc3fb33e298db5a86f00c7a0e5e0fb5c87dd72434eb7e8d4b509ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. Heuristics indicate this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=marvel+avengers+academy+download+2020 PDF link annotation
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/2158952427.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/42819993620.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/27201596311.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/mariwasusirimatolujudafa.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/78834336556.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xodikam.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pasuzuguxi.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gumiwo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138abfd59ddb---58718997295.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65187748669.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///sexomokow.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/540c64a0801153011950ef075c31a8cd/zedipuvasapeziwopasofefi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/5492764559.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/15103940411.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/miwubarexojob.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/remuxexiludegafiku.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sumapixaxovidufevajonekup.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/limukitikagagu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/titiva.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109030853212572.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xakepawumatem.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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 17892 bytes
SHA-256: 82331577202be2bef5b9af72efae35878c9bb330302ac8341c0ee25ea63428e7
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 11024 bytes
SHA-256: 3dc6050f8aa93d6dbed144580a484175f39e45b8d76ed9a9e07d4bb5d61645cf

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