Malicious PDF — malware analysis report

Static analysis result for SHA-256 153cfe55c13fa30c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 15:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bddef3f3fafe05f02cc0a053f3b2c1e SHA-1: a9ff7846303f93c58106a7a8298dbf8fefa934ea SHA-256: 153cfe55c13fa30c81e3ccd0dbddac4e5649f5cf744a5060893fdbd291b1829d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://maginsaatmetal.com/resimlerfiles/48980626982.pdf In PDF document text
    • http://metabolizmusonline.hu/images/upload/file/dorapomasiwuzamipimesuv.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nuwuzoregu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9b161ce2c0009c8765fa051f65ba1b35/79324161667.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/32845781042.pdfIn PDF document text
    • https://uudanbury.life/files/file/koworodurodopukomovanuzi.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/74125893891.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/wuxodejirusegifubof.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134424b0815e---53291926837.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/1281652478.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/jowozigar.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/48002512127.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/86721491165.pdfIn PDF document text
    • http://ridendo.cz/files/file/946455391.pdfIn PDF document text
    • http://skolky.info/foto/images/file/28244480412.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/riwesaboxopuxepi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/41047714117.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/17856692747.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109080653246025.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/pazetabevuwanipajez.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/dolotixepevobizatezif.pdfIn PDF document text
    • http://artepcb.com/upload/files/81268789832.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/jezatosiwuvesem.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/moselo.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/43338743061.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/52284714950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bahishti+zewar+sunni+pdfPDF 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_off0000c4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 20008 bytes
SHA-256: c5afe7f484e446ed94a3f9dee47f154ce8415087ac883f808a0bca3bc598641c
font_02_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 10728 bytes
SHA-256: d784c80ae75b2ff18e7eaf80defcc465cbe52c5586175241d5ad23374b45f40c