Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c42ffe55dd47be…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 17:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d769356fe2f723bd45b694ca573a7ddc SHA-1: 5486e0353294e156b4008e0db432eebc02b43e96 SHA-256: 88c42ffe55dd47beff9637697acf4bdc8b082b78ba5278ecef9ad413a0f23109
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

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 https://camphacement.vn/upload/files/92200384135.pdf
    • https://protum.se/file/31592979061.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/8012315760.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/kazetado.pdf
    • http://brunagabriele.it/userfiles/files/zamutoma.pdf
    • https://dd-inside.de/userfile/file/tegasokokeneva.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/tibomogu.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210905_160552_170.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/25989252161.pdf
    • https://fallsplat.se/bildbank/file/panizizojuneziruvavab.pdf
    • http://interno-kazan.ru/upload/files/14206331428.pdf
    • http://akcjonariusz.com/UserFiles/file/guvuvivugikeriz.pdf
    • http://wsmr.us/userfiles/file/26823700245.pdf
    • https://natyabio.com/uploadfiles/86100738702.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/rubonig.pdf
    • http://martonaroniskola.net/userfiles/file/24806022922.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/kijinap.pdf
    • http://donghotam.com/luutru/files/ledewazo.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/ripuxuwusomakorifa.pdf
    • http://bakoca.hu/files/file/57602591421.pdf
    • http://polyalpan.hu/_user/file/mogitoloba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=breathing+exercises+for+anxiety+worksheets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 16792 bytes
font_01_sfnt_off0000f5ce.bin
c2348ff29e24e960eb18524cd837cb31158118e21bfa98142bd47b64e84b1f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 11016 bytes
font_02_sfnt_off00010f85.bin
27068011c78c64a9482ca7ad0faef0f578a6a842532ec8fdb832243434a8dfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 18528 bytes

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