Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d4f2916b91dc0a…

MALICIOUS

PDF

55.4 KB Created: 2021-09-13 16:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb50c599516e1f58e191f558317d6df5 SHA-1: 017f8ee3c6188687d82f84db9b3ca3ae99030fb0 SHA-256: b1d4f2916b91dc0a4bfb3f836197505e7927a157034ef4595ce6dee8140a543e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple PDF files hosted on distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7186

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pn-tech.net/userData/board/file/71659725112.pdf In PDF document text
    • http://bookblog.kr/data/file/files/jalinolorakenil.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/kuzuwiv.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/11578875549.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rewalakesomadekedajap.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/patufozage.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109100423019197.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/misusudat.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_150024.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jenexexaze.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/fepiwapetunosin.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/vuronibuv.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/63152793401.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/safekadipunam.pdfIn PDF document text
    • http://anpharma.net/upload/files/fojoni.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/42304131416.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/xibit.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/25491995969.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e3864ddd1a241d39d593527aa0ab930b/99152592359.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/1633195579.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/33588013632.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/14086242254.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c70e62fc---dosafavetududig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=garena+free+fire+file+obbPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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