Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef32eb8078e79106…

MALICIOUS

PDF

71.8 KB Created: 2021-09-23 14:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb5ffdd96aae5aedf948dabc567a7b9f SHA-1: e0033e32021b5da3e8936276b5ff0c2682358dc5 SHA-256: ef32eb8078e79106f75ec30a979246558d801862e57fa6433cac255b628daa4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous embedded URLs pointing to a link farm, with one specific URL identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://remobudostol.pl/pliki/nulifekafavevurefinoj.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/8408570197.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/kunozemumutakutewuzato.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/gifabojotup.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/jelameb.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/vuvurafexojuxida.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/33974014863.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/518534698.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/55834839845.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/59111669357.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/17006772770.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/kugupesaw.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/tobenoxedufexujatiso.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f171621276---vujirijiza.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/gomasoter.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/55192146165.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/zodurenizeguxo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/53628547661.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/93466159921.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/35035773914.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/rarufogawaximozox.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97670419602.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/466295376.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/33471152372.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/85885248875.pdfIn PDF document text
    • http://freetds.net/userfiles/file/11272046033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+terminal+emulator+command+listPDF 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_off0000b6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 16404 bytes
SHA-256: 1e07b8b945591eae32b87c20f09c14e0998c374f54f450227e483ceebbd960b9
font_02_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10612 bytes
SHA-256: 3b0397b34fc973ceed24c58de8209b62eda48c9e7c4cc167b6ff75345301c841