Malicious PDF — malware analysis report

Static analysis result for SHA-256 018d3d16a3440760…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 22:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4adfc126b9f164f59c5213da7f0410f5 SHA-1: febe462f4a5d9d31f1f96694957f770a79256828 SHA-256: 018d3d16a344076008d9e7dadcba92408b413add4f74c2f2214481c542f7cd28
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=best+free+audio+editing+apps+for+android PDF link annotation
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zetejatukorefiguvugolina.pdfIn PDF document text
    • https://etadelloro.it/images/file/78910817429.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/bejavewupara.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/kakapomugejovunorulu.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/49701755780.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/zoxoda.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xibewasexaliteroduvenemu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/jerazoxafexuraxer.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/zatewifuvanevotug.pdfIn PDF document text
    • http://stylekd.ru/files/27545089726.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/selewenasugetivikixuleb.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jekuxanelolekopot.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/bowosevebaza.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_B7DE5898014319CA.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zanadovi.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/42674048906.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lerigogidu.pdfIn PDF document text
    • http://snft.ro/media/file/43321273640.pdfIn PDF document text
    • http://effektfilm.de/files/file/lepibuleraladematafibuxel.pdfIn PDF document text
    • http://lblussana.it/images/file/1992118138.pdfIn PDF document text
    • https://olterus.info/contents/files/xinugezuzubokus.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nopulatexeso.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/30150274160.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/pemalokotemupidijokema.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/81837599407.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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 17396 bytes
SHA-256: ef5e812911dca843b3bc276b360b92324ad2f17d3bceafc92bcc7aa992c8a027
font_01_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 10780 bytes
SHA-256: 65dc5e69ae410789b5032fa40f95929c68e1d398c2e8896e3fe83ca3261f3fc3
font_02_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1