Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b4373d7c1707c4…

MALICIOUS

PDF

62.3 KB Created: 2021-10-07 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 70ec7e12f2df831add1dc3417c85b7a6 SHA-1: b0606f1a728dcfc72d14ca87999eff1092ed33b4 SHA-256: 40b4373d7c1707c4a89e6000c829082845ccd89e28e75782f535a47cf4df054a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to disposable hosting. The PDF document body is heavily obfuscated, but the presence of multiple external URIs suggests an attempt to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to use the document for distributing links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4242

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=deed+of+sale+paper+size PDF link annotation
    • http://shepardinteriordesign.com/rw/upload/file/kozoxorosuro.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/3159960182.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/nibifamurug.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/89399644809.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/42679843153.pdfIn PDF document text
    • https://bfull.ru/uploads/files/35327753225.pdfIn PDF document text
    • https://motecx.com/images/file/80660110219.pdfIn PDF document text
    • http://schokobrunnen.com/idata/kavimumidukilufovefizipi.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/nomareboxiz.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/14244438855.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/tetefiw.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/42458955382.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/dupuwazemobejotodapi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146be2509510---80260682661.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/xoxaz.pdfIn PDF document text
    • http://moneymaker-gold.de/files/22470396929.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gikasad.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/fowaga.pdfIn PDF document text
    • https://lhdgv.ca/lpch2010/userfiles/file/60650664090.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/gofemamo.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/14556649291.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/jaziladepi.pdfIn PDF document text
    • http://ergakiland.ru/files/files/4865279567.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676d2f41ef---39805164619.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 10352 bytes
SHA-256: f0b3b24c84819fac3c3a91f5919fd7572b490a7cbadb0355c5bfdf9186e554b6