Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84f0d8981eb54ba…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 05:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e21c5777cabacd8e815fcbc6576e7d5b SHA-1: 560237ae7a4f08c57c66a067269ba92f677b6300 SHA-256: d84f0d8981eb54bacd9769ad496db5d15cde50bcad3d029a1d63880e04561b65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms and potentially malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ML_NYX_PDF_MALICIOUS classification. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The primary attack pattern involves directing users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=how+to+get+free+robux+with+premium PDF link annotation
    • https://aldaserwis.pl/ckfinder/userfiles/files/kabilijitatagarav.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/45766348124.pdfIn PDF document text
    • http://pasaru.com/upload/files/jipuvasatudezagakesotiv.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pepudinadolisizebodiwar.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zazeroxolugijijumamotitur.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/kebadolaxuwojipoki.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/jowaxajopo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/64626912635.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tewezofigavo.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/fajilo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0e239c7098d0051caf7ba312f5c7256c/26990505038.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613894375f932---wutoma.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fanivitopit.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/dikaxiresabozifipudivogat.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/wazuwojuzimor.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/40934154898.pdfIn PDF document text
    • https://vestol.bg/files/file/vifejewosaxobodigusexitot.pdfIn PDF document text
    • http://retailcop.ca/files/newetovevanisaj.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/46981045364.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/dokatujimuwogawatin.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/21385515272.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/zoduj.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/16496476489.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gisasoduzuzifalade.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/xusijusasefakebasof.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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 17440 bytes
SHA-256: 120c5dafdd97c970b5c90dd4603886ed235aed515a569dcfc10ab99d276d194a
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 10744 bytes
SHA-256: e4e2f3a098c2aa79fa910ee837b1a8eafa6b30d400d02172c77d28aefac62fa6