Malicious PDF — malware analysis report

Static analysis result for SHA-256 22378fee9ab11a95…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 17:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a4963c47c571a4e0f616cdec500a868 SHA-1: c2911037b4fe5b3ad3689a59ec92d2f2db847283 SHA-256: 22378fee9ab11a951805d877ed528f5a8468acf05314157c6c09dd81c8f7734f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://huntic.ru/uplcv?utm_term=value+stream+mapping+for+process+improvement PDF link annotation
    • https://terracell.pt/images/file/67683116663.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/vunaxudebixadawapuxakiba.pdfIn PDF document text
    • http://only-svet.ru/upload/files/15785469958.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/wulek.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/fupobukifimezulale.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/buzosanorig.pdfIn PDF document text
    • https://umartravel.com/files/fejonubogobitomuronuxege.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/89095481646.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/92287992038.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613386b1006c7---46405348007.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/telepotepopapovatiga.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/53770283737.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/12323200935.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161583e0f277bf---wotonuvopamujarilesogixuz.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/17634900587.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/majefetirogififakoko.pdfIn PDF document text
    • http://generaldistco.com/images/file/52417898108.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/45481706676.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/jorogexemikisor.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/memutapudewuzizibokaxok.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_off0000aa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5A 10956 bytes
SHA-256: 681f3efb2d105059cb01c21f039afc4a78c5bcda4dfd0bda3c1fa651600a46f3
font_01_sfnt_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 16140 bytes
SHA-256: a94b9d7ae3e7549fd91c3fabc96b01c03de9fe7d50a7dce4dd11a1fabeb1ee94

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