Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9d555a139e37fd…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 20:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbbb07ed2aa26ed7090acc915229c4d7 SHA-1: cc6879a2ac3cb78321c64e27998538834088d311 SHA-256: 5a9d555a139e37fdef1583cc4fbee215211d28838b3811b71703621a8b7062a5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5912

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 https://synerhu.ru/uplcv?utm_term=how+to+get+the+alien+gun+in+gta+5+story+mode PDF link annotation
    • https://girisimhaber.com/uploads/file/kewunut.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/migemibuwitafitimovo.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/parekoseluz.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/kofopevekufubag.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/18939045019.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/44028082035.pdfIn PDF document text
    • http://flexa.cz/docs/file/83517454126.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46425906764.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613342af682ba---9398306575.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/42281305474.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/73501645712.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/28405187661.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_0FFF9790704D1C90.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/97979592955.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e167a4a4c1---12323568297.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/buviga.pdfIn PDF document text
    • http://punaide.com/userfiles/files/69334621830.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/60490293813.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/sujaninaga.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/donikoxize.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/94673005859.pdfIn PDF document text
    • http://ruresept.ru/files/file/44978234347.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/18956982367.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/golezesemetolitilivusumo.pdfIn PDF document text
    • https://esvigo.com/upload/files/21618008526.pdfIn PDF document text
    • https://eniedu.com/data/file/20210902050047.pdfIn PDF document text
    • 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 17496 bytes
SHA-256: 8a42376dbd8f101d6f2bc4dd3c4658598c2a24c10b8a19abeac64a14492c2463

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