Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c6f8a9c5860082…

MALICIOUS

PDF

61.5 KB Created: 2021-09-24 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce708a981c22db76b08ee3e25901795c SHA-1: 2a6f7e985ebb28f1e79a8593522211fce3850462 SHA-256: 68c6f8a9c58600828c8f0132c57a0d04fafce44b35ec6f3581d7c3abf33ff847
94 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on distinct domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further indicates a pattern of using disposable hosting for these links, suggesting a tactic to evade detection or distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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 http://tencanpowder.com/d/files/sanofebe.pdf In PDF document text
    • https://5974293.pasarantogel.com/contents/files/soxefotanebatisidoliduto.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/34027008096.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/2613987186.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/18706356444.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/ninowaw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91962404443.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/pigiwexabaj.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/nigeled.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/wovegegatowaxamirixasa.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wijur.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/44482572871.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/86912270354.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109011723425167.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/jonekevivurudigaxubokaban.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/87087183062.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/22657806044.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/simuseno.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/marepuf.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jebexatij.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/razebiw.pdfIn PDF document text
    • https://emenu.hu/editor_up/viraririnobom.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/biriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+wwe+file+for+ppssppPDF link annotation
    • 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 10480 bytes
SHA-256: 71b9cb59e1329127083798bc21fc3a0b073cb9f40bbcbbb771808659b902ed8d