Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba2171df3cf736d…

MALICIOUS

PDF

67.0 KB Created: 2021-09-25 06:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d16f1232c0cb54d8053dea02f9b059bc SHA-1: 0f4cf6e3dd2ba3f6568dce1c0a3d4943fb23bcd7 SHA-256: 2ba2171df3cf736dad59b493424cba67c4e6d43e962d6deb8fe73b582b2a582b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, designed to trick users into interacting with embedded links. The heuristic 'PDF_IMAGE_LURE' and the high ML score strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm used for distributing further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://globalsublimation.net/uploadfile/files/xobezulamulawabaj.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/vekiminokekiwinorevix.pdfIn PDF document text
    • http://apvn.info/userfiles/file/lavibovulalerod.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/63651643595.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/woteladarelelemewe.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sakidodinagosuvati.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/75432578254.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/takega.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/4770211188.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210919061459009357xfhb3ggdlyav.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/46717205297.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/70916992856.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/90186809151.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210921_143733.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092219013643.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149650c19c35---10621474690.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210917024714823.pdfIn PDF document text
    • http://matras-devison.com/upload/file/puwixiguvasezukopede.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/77099125418.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/nufomekam.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/woxatetaperijatik.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109241509201810.pdfIn PDF document text
    • https://olterus.org/contents/files/mebemedofaki.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/wumodelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+finder+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8F 14064 bytes
SHA-256: c4c1fa1c29fadc29946be8873a4b57e096e3e1b624850bff78c7f6a5bb153d66
font_01_sfnt_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10128 bytes
SHA-256: d6f121a4eb70193c0bfdac68c1e9ffa5ed759913c7d49b7e02e3dc48be6bbae1