Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08f433c6b5dfd53…

MALICIOUS

PDF

74.8 KB Created: 2021-09-23 17:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee2b5fe7912dffdb319e7ab6c5c8f02e SHA-1: 6ba5b17976b1023c4c12aca050e0f7c9e557f754 SHA-256: a08f433c6b5dfd5379bcb0b8de91ee36168fc8409eb62b0f1d656fdd8a21e610
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to domains flagged as disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to lead users to malicious content hosted across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=b+for+word+meaning PDF link annotation
    • http://hotelniagararimini.eu/userfiles/files/gukikobuvemogaja.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/jepasedobuxifusu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d32adfd1---vonufapifatiru.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/19227311581.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/46583990931.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/24906913274.pdfIn PDF document text
    • http://paliukenas.lt/i/File/dutorapubib.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c219c67e---divaduvaguzezedewalupexe.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/redap.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/48048811926.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/40343133275.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/22361136499.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/bukamiruvez.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/ruzavovi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/49702432477.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/rudajisakowedenimu.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/gexuritatomezonulefisi.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/82072338694.pdfIn PDF document text
    • https://kimansion.com/uploads/file/99528202186.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/nadikosuzuwetipalifi.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/netefisagasa.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/gogikefuxinifoginol.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/puboxamori.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ropojo.pdfIn PDF document text
    • 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_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 10524 bytes
SHA-256: 3934c42166ab1faef9eb6bd556978c51ecf6eb105161e9969ccd4290b70ba8e6
font_01_sfnt_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 17144 bytes
SHA-256: 20482325c6979d668a8cf2f62a8756457582b9e6075d82192a53ab0429be3739