Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ecf000cb06af8a…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e30f1b4be6b62278098859b39589113a SHA-1: 59f214031a5fe0398df7e17815f9580c78d86bfd SHA-256: b2ecf000cb06af8a940e600149c78bf8dad29722c381c4796313de08170db32d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=kimetsu+no+yaiba+the+movie+infinity+train+full+movie PDF link annotation
    • http://normel.org/files/upload/file/18711558771.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/gexubozenelixoj.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/83816030805.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xazegupamemukirud.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/lixoripulag.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/wafewirupirag.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/nibos.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/nolatesoxasutogivewupe.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/revabita.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/jamoxojapupimupenu.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/70193908434.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xikawuzineleriwifune.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/jixiwisuke.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426ce2d8865---mitosivuzamomile.pdfIn PDF document text
    • http://jn-zhsc.com/upload/21684284973.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/wijakemobugiburotafa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161413a21aa465---40995304384.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/8126993209.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/84776802379.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/guwidudipegupuzit.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/35564956997.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/23933240638.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/6198744101.pdfIn PDF document text
    • 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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 20516 bytes
SHA-256: 8afe6da09e748066f4a87cd26ec54dd100c7056a660b05ea81b1f16caa0be563
font_01_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 10888 bytes
SHA-256: 6f12b7590567a229d9aa412b5c812cd3fe6b1a0363b02847f0450caa6ee4d3e3
font_02_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1