Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8501ae7e225ba5…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a5b1934e6588a47959470c24d8ba13d SHA-1: 827459c113c4ced9f7ca15400e2093bcccb3b02d SHA-256: bf8501ae7e225ba57d070da82f256576ece44801c68f81bee3e922cdbc46d5ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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
  • 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://bn-biz.com/userData/board/file/vivegebus.pdf In PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/67349280974.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/belosevibuma.pdfIn PDF document text
    • http://findusafranchise.com/files/files/sobuwatufusuxun.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/bugib.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614258d349918---71942361029.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/21375117983.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/nivulumovit.pdfIn PDF document text
    • http://labradory.pl/file/89478739736.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/75033335153.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupejojoxowurad.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/47825171440.pdfIn PDF document text
    • https://revive.fashion/upload/files/26304572112.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/97024721225.pdfIn PDF document text
    • https://sangogiaphuc.com/admin/webroot/upload/image/files/60150465847.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/mifazixinajesipirazesez.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/2952843246.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4f287374---libevelipoka.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/fifafezogewopab.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/55111347057.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/wusoxedevefabilan.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/89232481245.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/12044578391.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/suvawaneduse.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/10635266972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+cricket+games+for+android+2019+downloadPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 11512 bytes
SHA-256: 09fa77e04121d3d3e94bd3f0f820a936d3c8a94082f335cf03de8df792b70611
font_01_sfnt_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 14976 bytes
SHA-256: 9d7b845c381a90e0823ad36529a2b5582e49783ad7e740753c62c599ce6c53c1
font_02_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1