Malicious PDF — malware analysis report

Static analysis result for SHA-256 f408e2ccba828786…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 06:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70d06928d94e4ce2ced7460f4db6ba71 SHA-1: 7ae84a38ab84c2b99924b86691ca4506796b36a0 SHA-256: f408e2ccba828786dd4240b8e62c16ebbffc8303297cce4f02b4b86652399f21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=perfect+square+form+calculator PDF link annotation
    • http://tribo.kz/userfiles/File/65438460288.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/3366051888.pdfIn PDF document text
    • https://dyaa.club/uploads/file/setawujuzebevewanixusaf.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/wowiru.pdfIn PDF document text
    • http://yibetter.com/data/files/keduvofexejiziwunisipa.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/1252140107.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pofawivapaluf.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/162864582.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/96caa9d92cbf6a138aa7a01fbe220f5a/vegitinoseburetoxome.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/deluravemexamabawu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4b1101b8038e2ebc370cdf6c12ffbf9a/xizezerufimowopesal.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/91875638591.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/zemawineku.pdfIn PDF document text
    • http://espicycooking.com/files/file///82405028490.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/32083841817.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/48339676438.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/turovegelanabodatadidex.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80414924999.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/43444209922.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/55396843073.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/25346421877.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/20764802198.pdfIn PDF document text
    • http://3m18.com/images/editor/files/zetudefoliparutod.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/42925966563.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_off0000aee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 10548 bytes
SHA-256: 16f5326be913f659259e2f26efa967a1736d206422bc7d32c995d4a655b46959
font_02_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 14784 bytes
SHA-256: 318e6e129bfad734f848744f17e7528fc0169af5ab2fc58155055b9cc5bc16fc

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