Malicious PDF — malware analysis report

Static analysis result for SHA-256 44752f11dfd98738…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 17:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ceb3e04b8b2801235c3a2d0e68e4b5b SHA-1: 5f820a2b335a724efe156e8a71cb79b7172fd76a SHA-256: 44752f11dfd98738b485908f2badca82b268fe41d626413efadbc9864a711972
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ikitellirezistans.com/upload/files/zepupukajotopamotufapofub.pdf In PDF document text
    • http://blueyee.com/upload/file/191505431608.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/fofopoxozazunenu.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/domigafaf.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/refede.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/58827914932.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/80933542205.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/gunubesililulege.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/dunigato.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210906_EE9CD8D90233D6D4.pdfIn PDF document text
    • http://techbis.pl/files/file/zolugut.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/ropafonulizuxilobozafim.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/foxavojid.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gametokofupogafiv.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/90593230171.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130f648c72ea---84695569089.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fapokodusuvanaximawewone.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/64757009148.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a86d9276c---faxubu.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/lezemuwidikaru.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/wodibanusogutibetivefijin.pdfIn PDF document text
    • http://cartopack.com/Images/file/33376597905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=third+party+app+store+androidPDF 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_off0000bd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 10520 bytes
SHA-256: 5773ea67fe287ea6e9ed2aed00e849542d16bef08c0e7c943e8142e0b74001c2
font_02_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16884 bytes
SHA-256: f36fb3b984d3fc4831fa2564034f5ea2471db8e1757af756700c95b3e8be9dab

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