Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee6d9bf1932a498…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 03:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee3327c887e42db7ddf14f16cb684569 SHA-1: 6ef9d48d3b57aca81021737068de1cc0d5353740 SHA-256: dee6d9bf1932a498c7aa07b0426406bba933aa3bffff4263be9eb14636b5df82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to host multiple PDFs on disposable domains, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xatrbio.com/userfiles/file/bokafumoxepako.pdf In PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/74341099435.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/bifuwubupevemos.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/jejusibam.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/roferaxapurabotetipofed.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fabelevi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210902104503.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/pofoporonugagejonuta.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/nitiwejewufebibubaxub.pdfIn PDF document text
    • http://bushurov.ru/images/files/vades.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/79881215942.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/letebil.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63390510723.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/24072252535.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132949bbb8e2---fujozasetela.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/kunapanokakomigalasewa.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/42855213223.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/74646994453.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/41436077391.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/gijixafusipami.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/jonabusimob.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wudizozodevetujivefuru.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/tedikuridiwukovagu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/memuporilirikaseguza.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/kefalepawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=genes+have+codons+while+mrna+have+tripletsPDF 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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 10968 bytes
SHA-256: f7c27973e5dcc4b47b728026cd4dee9396c2c06a67400a9dbf777b423887fc28
font_02_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 16528 bytes
SHA-256: c8ada23b4bf0adb1e4ae3a022dc2efeafb928842cda6e8448b351c0c97b04542