Malicious PDF — malware analysis report

Static analysis result for SHA-256 028209cbca1ff02a…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 12:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66931743b2b557f4f81b4a3c5caac994 SHA-1: 80c6eae37106134924e1e214a35708c66130ef17 SHA-256: 028209cbca1ff02a005d84aabcbea77d71cddc45bb19f31b3416a65008e67307
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs, many hosted on potentially disposable domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://stefanourso.com/public/userfiles/file/84921858707.pdf In PDF document text
    • http://ky-auto.com/uploadfile/files/xoxijozorejuz.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/70888951888.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/67472982987.pdfIn PDF document text
    • https://priscar.com/documents/files/24483365948.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/peganumezupiwipe.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bexakokaxile.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/72814555658.pdfIn PDF document text
    • https://bak.vn/upload/files/53299305394.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/11462161444.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/7641420684.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/29736585745.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/wupijidubabe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161445b3f229f4---43273270143.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/70944397459.pdfIn PDF document text
    • http://charivne.info/images/file/dojuxapifov.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210909_0D190F21826686BE.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/12398148356.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/50412697144.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/3907505820.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109291759224917.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xekex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=renew+my+mississippi+drivers+license+onlinePDF 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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 17760 bytes
SHA-256: 1743902e7132a7d087be55783292afa49a8d59cdb0abecb5474402ef05c572cf
font_02_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 10724 bytes
SHA-256: 9b5a0b8dd24d2b5be893f4f5d97bd9e91b7815973f1e1d3d8ad74a96d1bfb937

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