Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4800f81d9034f0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 01:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 927229e7964b4310ab31046447aeb3a6 SHA-1: 1c24ebd6f3ee7be764ff3c9e7485f9725f9dbf57 SHA-256: dd4800f81d9034f047823b385a9fb4f350012cb959b35233a729ff868590b5df
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially malicious domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed as a link farm on disposable hosting, likely to obscure the true destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7670

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 https://concurs-euclid.ro/upload/fck/tapegekasujajodekenibu.pdf In PDF document text
    • http://cableesmaltado.com/d/files/renosukubejupujogijasabi.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/79391237783.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/76756003363.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/49388253159.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/73131149444.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12664168782.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/2363084693.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109081534501554.pdfIn PDF document text
    • https://pu.vienhung.com/webroot/img/files/16071466452.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/18908855460.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/goxipexa.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/12116703114.pdfIn PDF document text
    • http://blccy.com/userfiles/files/40314161221.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hhl260blq9mv63gu4d895v6mm4/wojofigodosexodupaj.pdfIn PDF document text
    • http://schubert-hh.de/image/file/57776701232.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/16423494545.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/674021bf1c341c9de1a66d2ddaa96de1/3701212091.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/55487602412.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/46642551472.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/92434279895.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/79649008367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=motivational+words+that+start+with+kPDF 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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 10452 bytes
SHA-256: 905fb491170511565723bb88c38e5dadc7ae7a74f2d660e75bb7586386859780