Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0636df3bdcf8da0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 20:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 349eb17cae2081c09120933d30ce9974 SHA-1: 4962be33c5d967908f1f28a9a28aefab08ba357f SHA-256: e0636df3bdcf8da0f083066a746d8f5a9e0763fda98adf580f0223b55a377399
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs that redirect to disposable hosting, likely to distribute further malicious content or phish users. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=periodic+table+valency+pdf PDF link annotation
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/12de0527463d6bc4e2d93d694a8be665/lixisolutumobutapadokofe.pdfIn PDF document text
    • https://ppsu.cz/files/file/15323648869.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/51234051445.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/54679072597.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/3368000502.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/nerubuzomoxumibalifafu.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/tirebese.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/femugofinifuzabomidadedu.pdfIn PDF document text
    • https://tpk-m.ru/files/file/63619998863.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/77659924337.pdfIn PDF document text
    • http://sdes.in/uploads/82060903463.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b06daa192---kunodazubozurep.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/mupenubin.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/pivuwededadujelasuje.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/64355854176.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///66891059555.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dejatokikoxowenalano.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/66303530358.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/vujuwumukevofavi.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/57512418903.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xedagodonuzajoratowo.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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 10768 bytes
SHA-256: eec93a8078c788d9ece65e718b9d4e2edee76ab8d54f741e9a74eff0d6d66f5f
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 17816 bytes
SHA-256: 7d0dadca95fe03d3db0d62c14c4a1cc6fd0c4030de3cda196c8fca615b5206cc

Open this report in the interactive analyzer, or submit your own file for analysis.