Malicious PDF — malware analysis report

Static analysis result for SHA-256 6859b2bfc8a29cf8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 15:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a1bf798f7bacb36f0544a462f388bdb SHA-1: 79a6f578d8637f8bfc9213b01ef57c847350b8d0 SHA-256: 6859b2bfc8a29cf832bc645b2a3915891b48fb02fc36d0a1d351a1d7725c3fb1
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms on disposable domains. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests an attempt to execute code, likely to download a second-stage payload. The overall pattern indicates a lure for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://self-storage.sg/images/uploadedimages/file/kowadipopikoniki.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/sevep.pdfIn PDF document text
    • http://cortabellanews.com/userimages/80242532912.pdfIn PDF document text
    • http://fruitvita.com/files/files/17979503889.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/35496026286.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/91959043974.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/22766690056.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/95425452820.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613478da894d0---zixanidatotekisubum.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/keloguragimuradafevoluz.pdfIn PDF document text
    • http://llux.vn/uploads/files/jonabiwomam.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a906ec17a9---reluvojijebaporifujam.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/faxopisurinikawop.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jajiki.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/29204696121.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/nujodigaponojene.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/80355793847.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/nokowakekafudo.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/lovenusafe.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gijiwudefufetenid.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/84777405346.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/nusadidenibiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+pocket+edition+download+versionPDF 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_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10848 bytes
SHA-256: 4be4128157b667faf4362889309a3d4fdce007623e82abc422630f4e72dd9f32
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16548 bytes
SHA-256: 9d78adeb4957e58f55b89d55ef7196a3bf9686185238cac10a192a1d910d7dab

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