Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a42269ca772607…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 05:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a7371f30415b866b30be0797d7b0d48 SHA-1: 72734469d0b3ab0bf702903763f0d2aef825715e SHA-256: 63a42269ca772607c37511a97274792d3494e4c1dab885ac45fccd11ce9b5eca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://barcelonamedicalcenter.com/files/galeria/files/butikirebek.pdf In PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/jekonaxufexe.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14527300817.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/25837323695.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kozewoxikiguwogozofur.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/pilekodosasab.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/10279197521.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/20305521488.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fimikejebidaluvabimope.pdfIn PDF document text
    • http://msiutilities.biz/documents/16121906647.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/zefeselol.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/mezopuroxilepumufulifi.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/58082911183.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/90366088614.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/92089344654.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wadexukorokenoz.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/vewolowadipumetukux.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/34050728481.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614622b104f58---40366043957.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/16264840231.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/losepuguporobafaxoruvemiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=d%26d+5e+spell+sheet+fillable+pdfPDF 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_off0000b3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DD 18724 bytes
SHA-256: 46bd85d0b26bdd796904eb0c600cc306a9aaa536b9d83d2d37bc625f2e630e6f
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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