Malicious PDF — malware analysis report

Static analysis result for SHA-256 909d169ac5c8cb85…

MALICIOUS

PDF

64.0 KB Created: 2021-09-25 10:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 981f2781a4601ff1a0104bf1d0720562 SHA-1: f2be54cdf6e40941f0a1f30a9f1798fd8dae7939 SHA-256: 909d169ac5c8cb85ccb465d09fd868a808272cc369239a0dc41c036b2eabffb5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5541

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 http://www.horakgolf.cz/ckfinder/userfiles/files/ripunomokofa.pdf In PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614534f50fa01---48862057006.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/mosoribaf.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/5991923119.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/lonoporuxodizokepixu.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/kodikajilemifujevus.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/xakupupejixumusuva.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/53600236348.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdd2f3037f---buwilebugoxufebuletozik.pdfIn PDF document text
    • http://synfarm.com/upload/files/donuxazudosutijam.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/pojowejudalubado.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/buwugukotipikiki.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f95q0d957o8l5ei1a76522hdkg/noputesedadedifakinumojev.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/47751143717.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/24980339736.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/pusasojujuzojemabapus.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/913281493.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/xodujigelovinixexo.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/30694760614.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/fibamajen.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/54054281961.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632530698.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/tewilotajosopiremima.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/jinimeg.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/fazuxokivudomedab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+developer+options+tips+and+tricksPDF link annotation
    • 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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 18252 bytes
SHA-256: e03732a1ba9d6cd9c41168690cda25ce0e69dbd9daac67130ab06e61e4b16b21
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1