Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15ae6ce6ec81927…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 05:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83326cfddcbec11569e953a29aa2192e SHA-1: 78d21fa0dd6cdfeae56d47399d80850169959d7c SHA-256: f15ae6ce6ec81927af757d174ec6073a0b1d88614d26a61b1e254794f9ca1ae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/67145983252.pdf In PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/41735444816.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kilotijidiparoxo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/22942887763.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/27066709489.pdfIn PDF document text
    • https://hirurgija.me/files/mefadedazotefewos.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/wimoju.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/diragedajiwonovuwam.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/xagevorudiwewugepobif.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/f63svddn0p4eam7njnb725ndgq/kujabegivu.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/22207415084.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/vefenofuwovakudilakib.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/16437308113.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/ropubelagoninasomex.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/vakixeseropikilamewuvun.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/46035363835.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nukeselen.pdfIn PDF document text
    • https://znalac.com/userfiles/file/23692325537.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/42584259271.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/kivenijobokosa.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/wuwegur.pdfIn PDF document text
    • https://krusomying.com/data/file/wikikovisujeze.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/budidijovosinosevutul.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/xisit.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/34700834842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=calling+my+phone+song+download+mp3PDF 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_off0000b6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 11044 bytes
SHA-256: 0addad366303a9943776e7b18c371d031ef953627d3b3b7f1db6a4e5a55344f7
font_01_sfnt_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 15668 bytes
SHA-256: aee64bfec43160d0695a69f6100a3ffa6606820553e4264793dc068987cfbf6e

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