Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d53eaf0dad8ec52…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eed0019ac568f3dd31b01bd6c660f54 SHA-1: 4a5b4f423ee568ea231dae4678dd44d3b44a928c SHA-256: 9d53eaf0dad8ec522c06303e3dadba7d458a653b92df86b4d232b30e286f33d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially malicious content, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://donkaew-furniture.com/ckfinder/userfiles/files/98405084654.pdf
    • http://koddous.com/userfiles/file/nupamipike.pdf
    • https://sooryasales.com/uploads/file/79766008595.pdf
    • http://dhalahoredeals.com/survey/userfiles/files/87108128529.pdf
    • http://sk-massimo.com/js/upload/files/33713871677.pdf
    • http://zl369.net/userfiles/file/7610786118.pdf
    • https://flyags.com/editorResources/file///dudem.pdf
    • https://chaletsuenodesol.de/files/digejapasige.pdf
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/17889802648.pdf
    • http://dija.lv/public/userfiles/file/99394487734.pdf
    • http://stacjaregeneracja.pl/userfiles/file/70212097080.pdf
    • https://kapefashion.com/files/files/41188935018.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17ca43dc2---bexojexuwipifidi.pdf
    • http://hitecds.com/userfiles/file/mikedinaxej.pdf
    • https://abzesolar.com/uploads/files/52061869095.pdf
    • http://praxis-greve-polley.de/web/editor/files/defenipujusadavebokumolin.pdf
    • http://saraiaser.nl/userfiles/file/velufizananodefatiri.pdf
    • http://chargooshads.com/images/upload/files/nogodokovilemi.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/peah7p1satmq9hkugvn0bl152p/rosiz.pdf
    • http://i-harmonics.com/upload/files/tegega.pdf
    • https://capitalsyndic.com/userfiles/file/bidifufiturev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=building+classroom+discipline+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
font_01_sfnt_off0000f36d.bin
76e379acf9b15051aa77fad4f50ec54218eeb9315e5374acb35433846f9ddaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 11020 bytes
font_02_sfnt_off00010cc8.bin
ab4de887cc42cb61c1f92f28db508c76d1a89809e4e27b30eea21f8fb0d88bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 17744 bytes

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