Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4a225fd40dad9f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 16:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 632f6f6c8a7b9cdca8efa4481f449519 SHA-1: 16132331b93ad4bc46c9aa23f4904094dcc3d75c SHA-256: 7f4a225fd40dad9f6b4472aa8a0b545feb04850506beb5a54dd01b5d5790a34a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF hosts numerous links on disposable domains, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

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.
  • 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
  • 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://pixomot.ru/uplcv?utm_term=to+zanarkand+violin+sheet+music PDF link annotation
    • http://regcureguide.com/files/files/risagotix.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/nuxijapiwuwenenupelepel.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/17257073106.pdfIn PDF document text
    • http://rococosofa.com/files/files/gulotagetonor.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/42752223469.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/68083103240.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gefijodemikikowulo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/58693709928.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/12341137624.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/2556042124.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/laminesivajovej.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/51057940106.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/fofikeza.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/92837539987.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/39580305131.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/mekizoburorumex.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/7038698920.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/musinubuweb.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/madenup.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/mafutoxupado.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/5263909463.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/nimuwavu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7547640d6b9f3ef1a22f6023a24b36ef/mipewen.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/kidomaxasuvijujanom.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_off0000d1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 10916 bytes
SHA-256: 36e898179c6cb25fcb0282518ca1268561c3db9b0ee173ad0c8914c1c5f75dae