Malicious PDF — malware analysis report

Static analysis result for SHA-256 910bde43f7ff2f4f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59741b303097da1edd5789f08d7d69bc SHA-1: 62444a7f1b388120c03149565aa51fb5091e50e0 SHA-256: 910bde43f7ff2f4fce6e6acd072b68f49e101fbdcb32daf92a797d2a9355d119
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, indicating it is likely used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

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://coretry.ru/uplcv?utm_term=arabic+grammar+syntax+made+easy+pdf PDF link annotation
    • http://tiwtactic.com/userfiles/files/povewupesatagamutim.pdfIn PDF document text
    • https://kimcert.net/E/file/bonuw.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/41969737630.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/fagumex.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/gamenuwewozeniwesupu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t82opnc7qs3m0cnpbeqp5roh67/77025409078.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/zopokebetupevifusiwe.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/77871823732.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/4408645974.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/58141563420.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/69634429836.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66265475364.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/mapal.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/vizetupofiso.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/336234035.pdfIn PDF document text
    • http://sinostandards.net/upload/files/22121659859.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/45944433800.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/9813130485.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/ledepetetufenozunubajog.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/kalenab.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tajifafe.pdfIn PDF document text
    • http://htwy.com/upload/file/pozefofonotaxukixezugezav.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/vexugeruvunid.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_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 19656 bytes
SHA-256: d6b43ca018ff80077bf2c9ab2ed905c9322d9714fb5e367e4bb9e7f3bd85624a
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 11132 bytes
SHA-256: 101bd81ed322494a24a8813e7b13b253940aef8fd1fe676f98961c83fe70e60c

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