Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0434e4f72a2d37…

MALICIOUS

PDF

72.9 KB Created: 2021-09-11 13:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e64dba87147dfd4012baa68f028ca01 SHA-1: e04428241d2eea4c20a050da0f68c35f8bdfde12 SHA-256: 7d0434e4f72a2d37ef4118236775a42818b0c822a34abdbdab2abfeb82a7354f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kientrucqhouse.com/uploads/image/files/dalus.pdf In PDF document text
    • https://datenglagi.com/contents/files/85980184405.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/fubolefuritilak.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906125221328019.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/66797561351.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce096e85a---relak.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/62324269609.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fizeg.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/97654592098.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/74507685156.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/wosiwot.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xozafexivojuzewowevanodim.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/16238446667.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/47164845120.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/takesozanevuminaku.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/sugefu.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kejusiditanefoli.pdfIn PDF document text
    • https://oasis-travel.ro/files/fexurexewumiwumana.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/1154671130.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/danemotej.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/poxajun.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/zosesaxonuwesufijixu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef904ac42---pokosuvuxa.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630446640275245578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=knn+classifier+definitionPDF 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_off0000bac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC4 10460 bytes
SHA-256: 40adcaaa2b9eeae0c465f8253dde349ea0266e6dee6795da87d2ce93c3ce1e8f
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 16560 bytes
SHA-256: ba46c1b113f678eed3efe03849e9c589ac979e48135a82bbc6b83b3a213a6da9
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1