Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dae6ec5ec29c9b9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 17:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09234c25030c4f07cc67a492e5ad579c SHA-1: 9f94e5e6da3e8391eb263272bd1458d20acb2ac2 SHA-256: 6dae6ec5ec29c9b9e821b7dae43b8267a22176686f7323b27c6dc8bdc8012796
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 identified as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many pointing to disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://phukhoabacninh.com/images/files/difuxuleboxukolozosewuze.pdf In PDF document text
    • https://buka.ru/sadm_files/gabubijejebugegusogijawoj.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317a13bd786---mawaxuwefi.pdfIn PDF document text
    • http://cartopack.be/Images/file/77806668068.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/79472136151.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/pijuleme.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/gamiz.pdfIn PDF document text
    • http://web5gstore.com/Files/files/64554177380.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/54835038264.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/94273905173.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/80475758832.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/monasumin.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fefidi.pdfIn PDF document text
    • http://mqskin.com/luutru/files/kogalopunukimaxeviw.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/zenametekebumipotax.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16131b81e052f1---genosuzudusawegimorubosag.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/telepotepopapovatiga.pdfIn PDF document text
    • http://www.toptehnik.si/images/nasuxefebezokivujeruw.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///bejojuzotetejoxisij.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/6125856468.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908214519.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/menawagukixulimawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ha+tunnel+appPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/gijujazopusepanenebofewix.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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 9856 bytes
SHA-256: 6a8d64ad3ef5c7e7f6d4502434a2c121645a6b9d11f69a02676ea46425a45b77
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 16808 bytes
SHA-256: c6a6d0e0ace6dfe03624f77ff7d4f781ecf88f80eb577a39d0e91455d19eff4f
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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