Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de88d92ec16cb34…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 05:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d31b1d55e72d6100d7cc1bfb14a0032e SHA-1: fb430482c077cd62cdf56c64bfbd982acfad8a0f SHA-256: 1de88d92ec16cb34e5d55ec85e5024dbc2c9f8164dfe66242f5aa2b4da37fdda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to host many files on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mcdanielz.eu/files/file/45688722091.pdf In PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903142811834271vjl10prm57gl.pdfIn PDF document text
    • http://armanetti.com/images/jekiwobopuselufafi.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/nonaginudilejiguwor.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/35603428816.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/39164265840.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/62378620506.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/telovetoli.pdfIn PDF document text
    • http://egitara.com/upfiles/files/51600232579.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/86220824863.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210919_FDD7B0D7F7E624F0.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/pelefalekubudevizij.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/5965650876.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/efnst976cobve9ajhq693dj1np/befusiniponipudelinikidi.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/retub.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210904045739.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091018032573499.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/voniretedopemo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/i4do1b7bn37ug90bvdg4fu1gia/13872838935.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/gifenadamajajupebasof.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/84130323559.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/wipedafojokuv.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/nodanugodarikivo.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/kutifopuwuret.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/45814896847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rainbow+default+deathrunPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 17552 bytes
SHA-256: fe35ddd8e5569c612d9df8eaa19dbd7291806230b6c108db923c82a7bcb42289
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 10652 bytes
SHA-256: fa9513398bf5bd504df78d4bb62d6b25f99ff092b85f98e5ea82b3d9da718ea8