Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12273508a10b192…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 04:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dcd5e91afc6984eb3660da764a8dad7 SHA-1: ae53f81b4079df7afd8a22b7b6e693934d8c8946 SHA-256: c12273508a10b192965a0fe28e49bb934f4bd06612ef967aab1435f20acfb8d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct and potentially disposable hosts. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

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://fairbank-ia.org/admin/ckfinder/userfiles/files/2313284570.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/latamujeladovega.pdfIn PDF document text
    • https://atl-50.com/files/file/66607245617.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/62998762226.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/murivabibixovadiximaka.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/9269442185.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vukiro.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f265c8548---46541282809.pdfIn PDF document text
    • http://labotinnghia.com/img/files/wuxoluwobetaritesugob.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/jutagelafixoza.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/kefafezagozelukumobikodum.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/35779726355.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vusimogizox.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/sororasejawilaledaduj.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/2006057834.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wuvovaxadejagovamilenotem.pdfIn PDF document text
    • https://finliz.lt/i/File/74596031056.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/91932833190.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/69587507777.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///lomizokidaxaxepi.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/nopexiwovazutaxajuwi.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/48275485278.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/timetuxutime.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/27182847862.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tunizugel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+free+on+a+firestickPDF 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_off0000bf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9A 10472 bytes
SHA-256: 0ece692ddc70b34ce4e06240362f3ddcd83bac6e5ad14ef91cb52133c752c77a
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 17244 bytes
SHA-256: a4d835a424f93a670b055bb27eedadbd4a7278035135dcec500621ea7350fc98
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1