Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc501cb73770567f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9d283ead6814bd4e28b053a461bd478 SHA-1: 2526fa7daca4fbcb88c5b5219ed59d6feb0f27b1 SHA-256: fc501cb73770567f48de0e36eac8475c8e6e688f3bcbde024be64b2cdbbec35f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to various domains, many of which appear to be disposable or low-reputation. 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 the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136182673915---gobedemufateselavaxenuj.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ed89f5688f80695d1701435fb464293d/xamudezumulexidat.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/fubodug.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/sitisisavobenuboxagorose.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/74780484700.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/40370642619.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/051625353163.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/voxenurozubixomewas.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/fopeguxapodozidadapelofu.pdfIn PDF document text
    • http://bluebossa.pl/files/file/43501360157.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/99748557747.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/2292910909.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/43408599802.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xadop.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/kijalox.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/vezinadibuzunev.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/basiduwalakogujasugozum.pdfIn PDF document text
    • http://isvpro.com/custom/files/66514488420.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/57350015696.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/woxarimutepiwovu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/36271632732.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/jakeketatef.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/93357553847.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/jewogumojulamosunexew.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/rogigi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/fazifixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+messenger+markus+zusak+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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 10804 bytes
SHA-256: 2b98a9d0cbb41c5cea97625cc1b90a2d21bd376b39186784fe9af42afb96633f
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 17440 bytes
SHA-256: e04dd23e13f2558040f94a27f0a7894980e8e82d10fdf15e4ad08f69e9082c2e