Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7eb31b09675d6d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 06:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92be54f602f0218ecd36dea1478fa6ec SHA-1: f0edfd8532e85de86f8ab496cf2c8c83649a08b5 SHA-256: 1a7eb31b09675d6d9732615ce42823bfbe1b507162d34bc9b75ba8f03426ca6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing attachment campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dogathermalhotel.com/resimler/files/11764399498.pdf In PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/49462085601.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/dasataburakiboxixiz.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/434bbe6883927a3746309c953a8c4e7a/7354018741.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/lulafefajubog.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/21/nurevimaxuwavejipebera.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/29939397054.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kovoruvesanogim.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/61723136723.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210923084827.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/oei943m9g5j7qdmpqhfcvd4uha/fagipuma.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/68113104480.pdfIn PDF document text
    • https://posh.hr/files/zigegorilegawotexodagit.pdfIn PDF document text
    • http://email-database.info/userfiles/file/35303860508.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/kugiketaja.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/25492325468.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/36514191492.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/papima.pdfIn PDF document text
    • https://digireg.com/upload/90743427841.pdfIn PDF document text
    • http://altinay-law.com/images/file/37104242987.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/65415957647.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/81194066275.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/8626998314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+backup+contacts+on+android+phone+to+googlePDF 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_off0000b01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16012 bytes
SHA-256: 522153e6d74f38c051eeaf109c64ef329e99c47f3b601917114539719eaea41d
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 11200 bytes
SHA-256: c9236b417e774bb67a691307621ae42afc516f2d3f6542faf9810685505c3498

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