Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d5257ed5131864…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 00:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e1289ec2a257db79cbd9e9132b14149 SHA-1: ba75fe9c9255578e232699a7d94789f11c35f39d SHA-256: 08d5257ed5131864b9eae84a3c89207c6a74fd3365f0bae0e7119c4833bacccd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of numerous URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/bewimepoxe.pdf In PDF document text
    • http://whipitleather.com/userfiles/file/sakonomabodasezudu.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/28536421084.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gofedoku.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/65154009498.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49621744074.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/61985643059.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/77867465533.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/74089157138.pdfIn PDF document text
    • http://azizolace.cz/images/file/zewikizulanezub.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/16164275932.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/lulok.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/51918329153.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pd09vieg2kugm3efh9i1o0fo41/72009185651.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/20206047017.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/vetad.pdfIn PDF document text
    • http://lg-palette.com/upload/files/xalusupoguradufureka.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/24448923284.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vurufetivukumefavira.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/90118660815.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/73993919652.pdfIn PDF document text
    • http://cutskytools.com/d/files/37918786619.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/29409334674.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/wibitogipaw.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/gopizida.pdfIn PDF document text
    • https://tadimtursu.com/image/files/fugefevuzukabomirudufuxum.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/72487589536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=programando+em+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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10280 bytes
SHA-256: ea5f642e1afd6ae94cce1725f226332755a40fcd9822233984765253d0a3fd02
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 19900 bytes
SHA-256: a6cabbc7119708335ee64d81563aa1b14c71d96e9ccf5ba654518c65345b66db
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1