Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b66a4deb9e4cfc8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 01:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7641d69464091befe71caacbf3101513 SHA-1: 84faef0058d642714f6039a1aa287c8c60420248 SHA-256: 7b66a4deb9e4cfc8dcd7ba92f5fb0ac35d54ad8225e7ee707ca8ebcb017fd9db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it attempts to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ncsccalgary.com/userfiles/files/10874514107.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f6bcc3f7d0e8c43189b44eaa0e1564b5/kipebajumotefoko.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/47386675442.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/66569104463.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/5760199139.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/46773619419.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/poselizololudaboj.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/91326828226.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/91645565153.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fewum.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/saturiniwexexedik.pdfIn PDF document text
    • https://mavibusiness.it/file/74333181822.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210910202200.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/83955896357.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mevomafimi.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/89867015142.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210907213330.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/tenitiw.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/sezarotiso.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13742500473.pdfIn PDF document text
    • https://ever-progress.com/upload/files/33437765826.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109110608277398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=after+we+collided+full+movie+online+without+registrationPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/65387998433.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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 17188 bytes
SHA-256: 28ecbe7d652f092380805ab18be01fef99a1a5c8fee6fe50f07ab405861136e5
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 11156 bytes
SHA-256: a7bf335a8365b1951dad8a44311da331c61d4aac86c74b7ad3724cff35ac2dd3