Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97c144a10fea1f4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 15:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72cd71be1bb6cbc7fa0476ab736d4e7f SHA-1: 610f234d882b6b17f13b29d3a9d3475640bc71e0 SHA-256: d97c144a10fea1f4b234fbefd46b19d0222e0317c2da5adfa80a783968190ef6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded JavaScript and numerous external URIs suggest the document is designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm, likely for phishing or distributing further malware.

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 http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0476de13---22585972990.pdf In PDF document text
    • http://ankamet.com/userfiles/file/37133812576.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/38217220043.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630554338.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sababokuvif.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/6815770617.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jugevivikodetu.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jivix.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/18502105780.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/wubejusilipogesur.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/18191302270.pdfIn PDF document text
    • http://manu-transport.com/documents/file/gabibezi.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/bimipojutadebofiniwemase.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/wodopojajugagobojubikanix.pdfIn PDF document text
    • https://kimcert.net/E/file/wixefobusup.pdfIn PDF document text
    • http://punaide.com/userfiles/files/6160040993.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/17559643577.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/51765372310.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/mamixafabolegusov.pdfIn PDF document text
    • http://superbarter.sk/media/file/97737841003.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/395863068.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9fd469f5---87721389189.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/daraduwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=smartphone+as+microphonePDF 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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 17932 bytes
SHA-256: 5dd2eb7c9653713137bd290d7397ef41176b7aef721a789f38a0985f36f56405
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 10668 bytes
SHA-256: fca7b635b5d6536c3f74edc39e334f23dd823f86157f8ff8351188b203ac6893

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