Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb970365b1e25db…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 10:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 637244d92026ad933551907804cf6484 SHA-1: d51bd0c6f47cbfaa168ff28a2970efad7f253f0e SHA-256: 0fb970365b1e25db829aec42ab3262dffa9a0995da40a3381c1fb7eeb1d4b296
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The primary attack pattern involves directing users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=one+hour+photo+watch+online PDF link annotation
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/rifas.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/mebivebas.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/88690402405.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/salivoxotafimepuru.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/sozokapivitanosuxuke.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/71431090737.pdfIn PDF document text
    • http://ketex.com/trcgp/ckfinder/userfiles/files/jelatoxuzevub.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/dagiwexeli.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109031927523844.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/3847678443.pdfIn PDF document text
    • http://konberdbio.com/upload/files/51959396153.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132229fb67e5---xozet.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/5024937621.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/jigozazusuzajolilonag.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/17402458325.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/kekaxuja.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_05_19_01_8208.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/89762467577.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/58143782830.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/71996393568.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fewemusufiv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343e4495ddf---32119169142.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_off0000c42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42A 10516 bytes
SHA-256: e0a3c8f9b2bce8e901a85058ced7e565372d3ccb5c0296fff137592a63d462ba
font_01_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 17168 bytes
SHA-256: 963e14597c68d03b940c46b140f34275aacafde9353a102202ac2cb9aa79fe6b

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