Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f45357dc575b6f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0330776251250c644f15e926ef69339 SHA-1: 54ca56b03b4e6e3311a1ca88e141bdb9ebf2b0bc SHA-256: 62f45357dc575b6f2c09e6a46954d8d0ef79d1d0733e8cf6432496315974c07f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious external sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://feldbach-tourismus.at/files/26414963222.pdf In PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/77217367813.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a39d37773---68655676400.pdfIn PDF document text
    • http://cissi.it/userfiles/files/30859657703.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/nelosejikuritek.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/74517818841.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/suvur.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/teseruxufugapavevimaj.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tavojopufix.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109021001325246.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/33477817123.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/nogezibufifomox.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/sesotixibiputukijepililid.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908091618.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/xafeligegemalefituxuxajix.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/87c7a5a8acb8258cfc09232af651729d.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/besibiribiminirujifawo.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/33849979014.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/dumizisab.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/21994808243.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/83059749463.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/79623142674.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210915105216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pok%C3%A9mon+go+android+gamesPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 18732 bytes
SHA-256: fcdd03b813b437891b94a8d4a5abc8139726fe011e736a8db16b55344c175fc6
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10692 bytes
SHA-256: dc4f26c65423c25232a6253c09f129a9b714f405b9e07e21f3c10f134f920cd7
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1