Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6823f6e3e10f40…

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 16:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 508f1988e45a1b289c6f1f788939e31d SHA-1: 9cd0691c2159ad559ba59b4137d386ca86e536fd SHA-256: 2f6823f6e3e10f40b73c25896c41ec54688c0931f1c1ac35ea5700c70ac63354
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://naplesredeals.com/userfiles/files/duxiketumabopekanivides.pdf In PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/82803187352.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/15561512921.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/vusarejulosapoza.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/zuwenosep.pdfIn PDF document text
    • http://thedreams.cz/files/67154018090.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a954de5f32---31853897624.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/44295763578.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/kupal.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210914_B895FFE662C62181.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/32866801052.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/wimudonigafimip.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/kikajasojog.pdfIn PDF document text
    • https://tebra.si/userfiles/file/18861595862.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/monaxiwube.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/59357361479.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/veleposaridiwive.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/pujorigevovireluzew.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/zerodixabatoneke.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kafinobefafalosapurotit.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/72298296264.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/57488124358.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/26436324753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+phone+is+running+out+of+storagePDF 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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 10796 bytes
SHA-256: 2f47a097a380552ac7d406d2d5ed55c93e6f7de385780eba2381dcc1faee5dca
font_01_sfnt_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 15512 bytes
SHA-256: 82cf26fd034d73535dbf7563395df3a416f460046ef5d6b45c34c795db55dee2