Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b851c75d210b38f…

MALICIOUS

PDF

55.7 KB Created: 2021-09-12 02:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2363c458475c032b21bd5ce34d0b7b SHA-1: cebdb308666bc750f091408ae4383c325da9cf1a SHA-256: 1b851c75d210b38ff647461a201e91114b7eaa327c8f8c711217dc9f48d63f0f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to unknown or potentially malicious domains, suggesting an attempt to redirect users to harmful content. The presence of external URIs and a link farm heuristic further supports the conclusion that this document is designed to lead users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8244

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://tabularasa.lv/sites/tabularasa/uploads/documents/files/xinomekalelizobusojuxox.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hl1r4c0ue322fa9k8ar1bbcgtf/72021386653.pdf
    • http://bridgeonlaw.com/filespath/files/20210906095747.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/mipuzuposejokabudufin.pdf
    • http://bftt.marketsearching.com/upload/files/54753441896.pdf
    • http://sinoorchids.com/image/file/zirojajidebedak.pdf
    • http://youzedu.com/ckimages/files/20210905041921710208.pdf
    • http://vwtint.com/userData/board/file/lojidalesiwisevetoki.pdf
    • https://qwert5.com/psum/admin/userfiles/file/55826769323.pdf
    • http://burattinojatek.hu/userfiles/file/dowesopudokuxota.pdf
    • https://securitydm.net/slicice/file/mabukinusegubopilanoke.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/wibisifemugotavalixavo.pdf
    • http://notariocprietoa.com/notaria/documentos/files/loduwiko.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/84767069957.pdf
    • http://sostrevalli.it/userfiles/files/40745997611.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/42551695188.pdf
    • https://textmakareknutsson.se/upload/image/zajororem.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/21143322234.pdf
    • http://kcpsystem.com/userData/board/file/20575088021.pdf
    • https://ever-progress.dacola.com/upload/files/72861964261.pdf
    • http://krakowska98.com/zdjecia/fck/file/93837033180.pdf
    • https://grnca.org/img/files/files/50966860685.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/tafera.pdf
    • http://quick-thailand.com/images/uploads/file/dogesaloxop.pdf
    • http://reutlinger.pl/userfiles/file/66731207223.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=plug+and+play+game+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A2 16792 bytes