Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9c7870ac6159a4…

MALICIOUS

PDF

47.2 KB Created: 2021-09-27 05:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 17f06bcec8d800700c288147ba5d357d SHA-1: 382ceba8b4b77b2cdaae6ffb5e18b7ce36c88c0b SHA-256: bd9c7870ac6159a49385d687427dca90812001069ce310893f56163f67eda7c1
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF_IMAGE_LURE heuristic indicates it uses an image-based lure with a clickable action, typical of phishing. The presence of numerous external URIs, many on disposable hosting, suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest it is designed to exploit user interaction via embedded links, likely leading to a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6520

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 47 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=messenger+chat+heads+apk PDF link annotation
    • http://impex-italia.it/userfiles/files/rojelijorazoluk.pdfIn PDF document text
    • http://rapet.hu/files/ganijomopuzarebubosuma.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/80130913137.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/febeku.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/novajeliwupemamazaxamosa.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/topaneze.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/nikuzipuxoviram.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/pibigowuxenaxivadu.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/3464231392.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/19300841628.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/32303057299.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/98335373086.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/62935049882.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/46083581600.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/vegipokajaruj.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/14787602776.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/15389428831.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/wazaniritumokefakod.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/fonifi.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/nulanufi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d794c3499---80889165626.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/letewovaxabizumadozopak.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/kakofewaza.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fde8ad9c2---mokawupumidufer.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907095651.pdfIn PDF document text

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