Malicious PDF — malware analysis report

Static analysis result for SHA-256 138deb4c8ed7593f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4cccd503e91ea898a9aff6af7a95b52d SHA-1: 59875b06f3d51417c6918e15e81e95e365359ffe SHA-256: 138deb4c8ed7593fe916406c77aa5fc3086a3a64e185ea265308267467e42c32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files, with one specific URL identified as a potential landing page. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://budka39.ru/files/misabusigigatilesegagix.pdf In PDF document text
    • http://podlahypilat.cz/admin/file/ximovajutoruw.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/28178975262.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/todijideraturudaj.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/xedimufusikefavobejal.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/waxipate.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/23978145832.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/polabofimuwefifir.pdfIn PDF document text
    • https://actorconseil.com/files/file/76977152279.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/40388773632.pdfIn PDF document text
    • http://zimmerei-possert.at/48924891660.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/363715023.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/54b7425204a270b03b1afedb0d85cdcb/rosafevosodujeluzodiji.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145097ddab8f---96218849057.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/42081885993.pdfIn PDF document text
    • https://hoongnau.com/upload/files/92446548600.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/pibesumagexofug.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/81786800012.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/garat.pdfIn PDF document text
    • http://stefani.cz/fck/file/japuritumenasaxino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=jhandi+munda+hack+version+downloadPDF 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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 20204 bytes
SHA-256: a717e1f24d6564a7b2fe43040b561ac3517a737e47053dd43df6e0ecc1e75e16
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 10872 bytes
SHA-256: 6ca77a00a1890008e8937716d9da5d47c72ab072759137c874975b8c0c90606b

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