Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb52f2320ae5287b…

MALICIOUS

PDF

67.5 KB Created: 2021-09-28 08:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c8c17a6d80ca0cb7b3029e31ada1def4 SHA-1: 38edca91dea5dc15e1933109860881e16d149c11 SHA-256: bb52f2320ae5287bbb2fa5aafb3617c766646c9e9cdad18c8af5a4e971127856
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a large number of potentially malicious sites. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://inwebjor.ru/uplcv?utm_term=adobe+cc+2019+mac+crack PDF link annotation
    • https://samsungvrvklima.com/upload/ckfinder/files/zuvufiferim.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/sojudirivudufadikasokanej.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/bijumudaxevozudezagu.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/22389429479.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/vuxojogugixuwudelalosubow.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/82678833797.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/pumojabinaxojibowatusizos.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/30773650159.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/61836044411.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nopakaravimosafuledadosav.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/13373791461.pdfIn PDF document text
    • https://yasacompany.com/upload/files/wubefa.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wepevosoj.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/vusefim.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/segusiso.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/77428779306.pdfIn PDF document text
    • http://bluebossa.pl/files/file/20314273773.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/jerurulopomewefatosisagi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/kagejimoxuvuz.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/midelokokawukiruge.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/wekobadirexofefanabonuna.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_off0000ac23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC23 10700 bytes
SHA-256: 64edc827bdef06c324b5920fbc41f0a92e118a185883ac6936a0f8e86c8f5059
font_01_sfnt_off0000c4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C8 14484 bytes
SHA-256: 6b5fbee6c4933800d8205d962518c88938b89a36cb79c300f5d9d2c38c160ab9
font_02_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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