Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9b4818ea8e7057…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 18:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf1a61ba79ecbd971e9887abb152809b SHA-1: 399e65c72113397b5cf62274624e6580eea87280 SHA-256: cf9b4818ea8e7057f3f9fa81bb329ce9fcb43a0c12344545dcd37831b9d3d15a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content or phishing sites. The PDF structure and the presence of external URI heuristics suggest it's designed to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wekakijisigedewedi.pdf In PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/73440948966.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/16850345706.pdfIn PDF document text
    • http://bienbao.net/uploads/files/95301106718.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hm04avfthsgb2cavtv3tfrt5n/vuvewimexa.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/29379858331.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109191346147370.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/24902713269.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/budotogakiwasizitizuke.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/pukile.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wofebixulivagupulajunow.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/pagesofezivulaguze.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/34190105766.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/filil.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/30544339213.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/kurugijixukabajomeg.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/suzemegezojezaze.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/6277322073.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/86592780792.pdfIn PDF document text
    • http://juncheng.tw/upload/files/suguwaxixufotuzuvebufage.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/jojas.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/44673624018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=learn+bash+scripting+pdfPDF 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_off0000b77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77C 10828 bytes
SHA-256: be316f9c1385687d717b1ae3915c071ccad3630e60e3b5e006e22e9f51fb7252
font_01_sfnt_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 19112 bytes
SHA-256: 3ea1cbaa0ef08418ae5660ba2a391963c8a62ad35ce2fcca887365674fb7ed8e