Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ea952527a326d3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 10:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1dc172fcefc1ac51832fa70aef69ddf3 SHA-1: 5d18c7af34358cfca039f309dfca61c4021a3c83 SHA-256: 35ea952527a326d3eaaf05ec6e9042531c7e822f48b6829de7a5e65e89681cce
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 point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bdfb6ca5---5360359613.pdf In PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/mugif.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///9543163021.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109121914131877.pdfIn PDF document text
    • https://titishop.co/upload/files/xanugumelukebenaf.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/35633644157.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/85414339052.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/riwun.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jaliximuxe.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/loramanirufom.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/wunigonurebuturi.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/liweduxani.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/97901200349.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f67ebb26cad74776063a257099c2941/gezifopuvijatobobopos.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136585d48f57---27439423344.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/tirujozisusuzokopogupo.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/48077651865.pdfIn PDF document text
    • http://abnicum.com/files/file/rewin.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/95442886127.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/biwoziwe.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/42288317203.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/22059984171.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/17146092120.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/30166164031.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/novugojadegagimuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sword+art+online+dub+kissanimePDF 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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 10904 bytes
SHA-256: 5e204bb2240d281f94eac2dc63f04ea867429485c8b8cf9c93c92207972a5004
font_01_sfnt_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 18776 bytes
SHA-256: acc7111c1565e845df1d4330fe4203c6dc5a27646054f3f6969323f32b6886fd
font_02_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1