Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc976ced0e53c889…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 23:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2178c9ea1780df49cd8c7cf30bcf011a SHA-1: ba58313272eb67c0f7f3abd1e4517c4c49128fb4 SHA-256: bc976ced0e53c889c5f83319bc345f0a8032ac114df70833d73524b764ec5a45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious websites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://strategie-online.net/catalogue_dynamique/file/8051590596.pdf In PDF document text
    • https://vnycc.com/userfiles/file/22357978461.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/weramubepotuwujonesepo.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210901065013.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/96977879060.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/titunutevi.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/60366695554.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/30884175017.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/kizaroladebifojaxajabapun.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/50315756992.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/padatigitoliwe.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/60980545848.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/97093551879.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/64655556614.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/3626102206.pdfIn PDF document text
    • http://szpk.hu/_user/file/ditofol.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/dulefumedeker.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lf1kl3nms9o12jd661n79oskva/53335872318.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/80079520250.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fc884269678b4d0ba62e4788a6276234/88827399944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chromecast+for+macPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 10388 bytes
SHA-256: c2db4b14679045cd466855894a1de6ddbf056deb8b10620ef9d36ed7d309e7f8
font_01_sfnt_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 19424 bytes
SHA-256: 5aa99ceb97d83d858a0810bbf76506843f3d962b88dabc56db25167c29e62222

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