Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fa7cf0ff97c0f1…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 22:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bb265032efcf94651bed529c63eaa13 SHA-1: 195d4033bdbced9ed7bb2547b1ef1bf5f08c8405 SHA-256: e3fa7cf0ff97c0f12764d2d4d0cd14016746db83af934932306821708f4e7766
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked URLs. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sukaunited4d.vip/contents/files/nuxevofipusum.pdf In PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vuwokadije.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/sodomadakavefudozosufuk.pdfIn PDF document text
    • http://scsytech.com/upload/files/wukodafofilujemosi.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/kupaxus.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/98821216737.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/budoxevabuseralimojola.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/83841723676.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxigosuve.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/74131697057.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/woperepagonejadijore.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/wivotajataf.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/mitajeg.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/sifurubifebi.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/67000434221.pdfIn PDF document text
    • http://shahgrp.com/uploads/pafezilatikabokovisu.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/pibogewepopolozirabozodeg.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/14969561736.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/nijom.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejedopo.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/71796474565.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/65479539589.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/98868257574.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/37387239292.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/89763128840.pdfIn PDF document text
    • http://dezis.ru/uploads/files/pojurakala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minimize+window+shortcut+chromebookPDF 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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10896 bytes
SHA-256: 2a310d6db822fb586b2e5b0f53968c5bca1561f6915fa63cd41b83149c7c0b7b
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 18064 bytes
SHA-256: 9cc8b554a3f3a619b2fb06181a1ab06298e9b101d40771e11b3908e776e87e33
font_02_sfnt_off0001366b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1