Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff01a4abf8409b2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 00:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9e08fe4618e5b53090bd8c017a96d84 SHA-1: 6fe4cf39d5f154662c2f9e07907187ae0ae70798 SHA-256: fff01a4abf8409b269747a0d84d51956e5335f26ef67653ce586273f24ea8e4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee3adcbf4---24600958578.pdf In PDF document text
    • http://tao-ssct.org/data/upload/file/85131080382.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/gufafexaralibodigeru.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gofipotulotomezajefe.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907092359.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/67618788415.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/xinekoj.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/46269203565.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/67314561049.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/23038532489.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jakagivufogusugobupinaziw.pdfIn PDF document text
    • http://carszana.com/image/upload/File/95715886045.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/munusaronusonofifas.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/39165838074.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/33909606222.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wevosogudaxopegasatur.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/gobebarukaso.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/rugiku.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/suzixalivunegiwilenojazix.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/sififid.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343eb1a53bb---misimikiz.pdfIn PDF document text
    • http://dsfly.com/uploads/files/pefaxifadakegexumofelenek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=planet+zoo+mobile+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10436 bytes
SHA-256: 3f81ff0eff6fa0881dcb75730588400403cb337c3349031780954674a29ae1f3
font_02_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 20564 bytes
SHA-256: 96528278a3c17b85a8e86604bbf0296e8d7f60298b52948ce0381887b00199a8
font_03_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684