Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcddcd8927bb525…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 05:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1e7817745cc9301f47c5c82bc51a8a2 SHA-1: d2200d929a780c82ea42e68b5d1303a5dc30eb15 SHA-256: bfcddcd8927bb52502ec6782be0b0ea50bbb1a9e7f9586f35008b8574658c8c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the final malicious destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV detection further confirms this, identifying it as a phishing trojan. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://floral-design-lindgens.de/userfiles/file/sefofipanafikiwefurupix.pdf In PDF document text
    • http://tpokebar.com/uploads/files/nisopazijegiximuvinabugu.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/dasokitifuzas.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/49245882142.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/palamitiposagupovege.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/rivezubozogifagon.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fovilupigerabisupuwo.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/bezeluxeput.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/13730954785.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/40451123396.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/jufewawinituxuburawibeme.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091204170615064.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/77979005418.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zaborojuwezas.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/38191339634.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fiboxenujuzoteli.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/nowanevig.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/30645952836.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/14042524211.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/jenobekurapajosilufope.pdfIn PDF document text
    • https://equimat-cheval.fr/file/20440456688.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/7025308735.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/2817770143.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/dusivuges.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vekelol.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/15386738470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=roblox+starter+housePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10396 bytes
SHA-256: b4e8b46caabc10db518627c209b1d95d1e0f6f57b429cee5de8e475f37607758
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 17856 bytes
SHA-256: 5a862167d1355f74b12d6c96fd2e7a4139e6c456eeff6a1298e979f46e05d83d