Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4488b4ca1312b5d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-25 15:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e340e9763eb403f354fdd4b2c9e8c582 SHA-1: 6a319627d4048034b72bcc542e1b85e5860df802 SHA-256: f4488b4ca1312b5d2aa1d2ad0299fd02f0bbc593ad8c2e3b08bb77aa50f8ea52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://pistant.ru/uplcv?utm_term=weak+upper+esophageal+sphincter PDF link annotation
    • http://harchovyk.com/userfiles/file/jabeporemapokitu.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/72417406299.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/4d0e18b23f545ef98e5a235751629a77.pdfIn PDF document text
    • https://dcimx.com/files/fenerojufurami.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/matawaxarub.pdfIn PDF document text
    • http://zeci.nl/im/image/dimizedinusemonefo.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/pobuzifelutumagim.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/vapoguvurulubuzosamodaz.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/vugebutilavegiv.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/gupasiwabaluzufogoxofo.pdfIn PDF document text
    • http://kammed.com/userfiles/file/xivutijekefika.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c9f2ab4a---fadelogediludaxokim.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/nilizewujamagorotor.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/lunaxezarusapik.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/95100048761.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/pivezuzafolisir.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/97918860190.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109190527313364.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/4563587336.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/levinakulozivad.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/niduputez.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/53378086126.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/24363149224.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/56194993991.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148125853373---8656992343.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/mekuwijonumasuwuwiwuwakim.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/tejadabikekotexip.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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 18352 bytes
SHA-256: 63d830c930c7d32a75914cc884d5df15afa2939356d439b91c12f1da6580a250
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10840 bytes
SHA-256: bcb7c38b47145402c8d4367afdea999801792665dd084e3c1d749375bf91537a
font_02_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1