Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf6d3b787877d78…

MALICIOUS

PDF

70.4 KB Created: 2021-09-21 19:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41b2b32d812afaf24ac4dc19a890c2c9 SHA-1: b71f0a79a0a8e6b494aa2dc570f790ee90c96c78 SHA-256: 9bf6d3b787877d781b13018031c0a261aa9424e35685e8d232e5e86f9862fa5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or spam campaign. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support its role as a malicious document, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=free+robux+for+offers PDF link annotation
    • https://traveletrust.com/basefile/traveletrustcom/files/830574624.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/40614862518.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/43699756931.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/99761232217.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/jovazoponozad.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/82289034406.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090422310873499.pdfIn PDF document text
    • http://llux.vn/uploads/files/wivipizumidoz.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/xudoberepopebi.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/92076594045.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/90849822421.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/37206735299.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/29995674574.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/63506692184.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/96134200986.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/85116cb590b3a5ce481577eaaab6b368/32783835027.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivibagovaxaterakasebit.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/50717613993.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904110636.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/42209821065.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/26359652145.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/71340599450.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/nizizokogiwemixomin.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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 10024 bytes
SHA-256: 0d8e615baf8a41140ea73b1af5bf944051c38637c7af7aa085b6aae2a7a56089
font_01_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 15836 bytes
SHA-256: af215c33dd5b0497167899e733011edc6ba25a29f0f6de9ceb389dfe2305a1b5

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