Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85336a9b0c80bd9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 19:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4552f5a2f4145b8abe3b4a02d8e150ea SHA-1: d7ea9e8aef2b5368bf1cef0e8123758b326186b7 SHA-256: c85336a9b0c80bd934d6bc22ffd82867102e922fe066e564b634b07cee63137e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a phishing or credential harvesting campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kclandscapes.com/ckfinder/triplebuserfiles/file/40601467293.pdf In PDF document text
    • https://parkettworld.com/upload/files/zexexasipajuz.pdfIn PDF document text
    • http://shahgrp.com/uploads/17404937267.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/jesewijasuzolef.pdfIn PDF document text
    • https://olterus.org/contents/files/59983646863.pdfIn PDF document text
    • https://grouptm2.com/contents/files/malurudig.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/voretedijiwixudisuviside.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/kudebuwakotonomeb.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/vawusetabasisilomawadak.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/25501820739.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/27312370189.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/vapozebepakexiwunakoma.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/42164313317.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/72714792200.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wuxed.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613453fc15ad7---lujaziz.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nekaporimikikanedogibuxam.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/pugubolotagigevudeg.pdfIn PDF document text
    • http://dnepropress.net/files/file/30852997036.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/29860233546.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bavik.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/xepixenubiwuzabafemajater.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/43323797950.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7cf6f1c9---gobezamevututiviwofimup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+s5+mini+gel+casePDF 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_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 10780 bytes
SHA-256: 4daaad283350c504cd0d7f63365d5dc9c56e0814f2bcb5006ead17592e352018
font_01_sfnt_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 16864 bytes
SHA-256: eb3881870e2462b6cb4851548617981fc9802c537431299e92d34a345ab22b78
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1