Malicious PDF — malware analysis report

Static analysis result for SHA-256 95614f4eb379d006…

MALICIOUS

PDF

46.8 KB Created: 2021-09-08 09:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fab6e7b2cf70cc66221139fc69c3d530 SHA-1: a69593acd299bdfe309aa048cfc73f4831ff3431 SHA-256: 95614f4eb379d0063c1e9448ee1a08a5748355d01e1eeb0cbec4c72229ad654c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or obfuscation, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9532

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://surtek.biz/image/files/20150121_132909.pdf In PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/96711561645.pdfIn PDF document text
    • http://shesob.com/file/files/44638141690.pdfIn PDF document text
    • http://martonelektro.hu/files/file/vefexunitikikebon.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/65375149171.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/wizewavabimemiv.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/13628388291.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/bagunegub.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/xipuxazu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/74885513626.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fovowazun.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/7835312006.pdfIn PDF document text
    • http://usateatop.com/_upload/files/856018640.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/708377246.pdfIn PDF document text
    • http://checopharma.com/upload/files/nisede.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/77846653427.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/69547608240.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/linan.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=evaluation+models+in+education+pdfPDF link annotation

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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