Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f7c328354b9a9b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 00:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80ffe561e99e1944c344a2807cdc8595 SHA-1: 80bfa10048f69f8822ac74e6bc93a080b5ac2542 SHA-256: f8f7c328354b9a9b82511e4679ed395c121246af627191354220fe672346fb44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kbidc.kr/upload/editor/file/1631770747.pdf In PDF document text
    • https://al-wesam.com/userfiles/files/sidumajikalekufexugulo.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/wuponirarufof.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/jixejekidaferuxufex.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/zekawexugebi.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lodalapizegejam.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/8347187398.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/25223061963.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/1344533300.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/66340565183.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613241837e8cf---37877544216.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210923040707.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/90223237723.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/16736782506.pdfIn PDF document text
    • https://5uempat.com/contents/files/lidexid.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/mevakuvuritirilolago.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/jutunuzaxudizolugozetajo.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/supuvu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/21719202943.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zokojubosutel.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/45071139712.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a4e51645---pepulowinuxezukumeleler.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/21313247171.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/75650484983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+14+pro+max+price+in+bangladeshPDF 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_off0000b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 16788 bytes
SHA-256: 32d7a7b795c45d8deed0a09238235e3ff713430129af159cb1a070ae3f4be1e6
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 11184 bytes
SHA-256: ec85cc37d9a3d4ecf6bcd6e77563f09b5fb48ebc86562b6f9536ae9a991a5c51
font_02_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1