Malicious PDF — malware analysis report

Static analysis result for SHA-256 2704a15bd9f543f0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 11:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1bfc04cd20911f573942aa34f805706d SHA-1: b3fa28451615baa1ee4f4bc69bd4c665184ca91e SHA-256: 2704a15bd9f543f054d28356700f61a8fa0dbd72c037b702d278c27e5c19d582
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://interstyle.org/content/xuploadimages/file/baxejovakipototugowibizix.pdf In PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/junamanup.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wurukasumizizutazi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/nizesusobamukijajipotisev.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/doxud.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/butol.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/buzutafutefobuzekerun.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/49733509568.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/23872156943.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6cf28e0a041f68d326f06b59c9d70018/1921698723.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/40305081839.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09159f7b6---vitiwalugusas.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/kebizazexerasesi.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/wufaruganugexipiro.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/24139146886.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/19653573973.pdfIn PDF document text
    • https://isleo.com/i_photos/file/67268067529.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/gosofevememe.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/bibodusupe.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/zoxenelobudivoludupezif.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/denefeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+block+on+whatsapp+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/42116743849.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 17064 bytes
SHA-256: fb1d2fde87638f0dadae9bad86257cfb78a45c017e9a777d89b13a997c35e253
font_02_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 10788 bytes
SHA-256: 5bd8ddb50a5c532db750780f71e36cd2d62576dcc7c19b1be2ab5a80abb1042b

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