Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2670e2ce3f9b81…

MALICIOUS

PDF

64.0 KB Created: 2021-09-08 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 539814a98940b695ade9f1f0e829cbc9 SHA-1: 4aaaf1e425f708f08380dcef8df29c0e0c88a5e0 SHA-256: fa2670e2ce3f9b8165e939b91a7110b2aeac7e79a38d46014c6f3ff7cc2affa8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, by leveraging a large number of external links. The presence of 'utm_term_redirector=True' and the nature of the URLs suggest a campaign to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8311

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://khocabien.com/uploads/files/jutajufe.pdf In PDF document text
    • https://searchkar.com/ci/userfiles/files/vorubuga.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd17bfa10---vodojutib.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/32390726923.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45039484482.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/26755613582.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/nudodareg.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/44867624376.pdfIn PDF document text
    • http://kaies.net/upfiles/file/jusulupopa.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/gefudabelatipegi.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/93897506221.pdfIn PDF document text
    • http://schokofontaenen.de/idata/30253448598.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/jagok.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunoxedeviv.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xavorafelodon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=droid+transfer+companion+appPDF 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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 10736 bytes
SHA-256: d20eecd1f4ca2063ac2b4ae82f6f04a219c6435fe1eb3a0a547aec825feb616f