Malicious PDF — malware analysis report

Static analysis result for SHA-256 93716245b41a2fa9…

MALICIOUS

PDF

134.0 KB Created: 2021-09-19 08:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f847682cc0690b80356993d21f7731f SHA-1: 84858c1edc5609ce468121fc1bd69a2992d7772d SHA-256: 93716245b41a2fa9098339f4121e8f423d9687ecdbadf38bd16956a76dc18f93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/75728086064.pdf
    • http://reutlinger.pl/userfiles/file/78011233081.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161441fb92d5f7---37815132462.pdf
    • http://ipllaser.in/uploads/roruvurasijumuliropefi.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/48492628210.pdf
    • http://ttccid.com/userfiles/files/31333267455.pdf
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/87409299138.pdf
    • http://wksx.top/images/userfiles/file/rigabelinugejogizafi.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/89841750102.pdf
    • http://irpuyesh.com/cache/fck_files/file/fixeberutokalebud.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/ludajizolenogo.pdf
    • http://kdbelektrotechniek.nl/uploads/file/migosuropezapeju.pdf
    • https://saunadlaciebie.pl/userfiles/file/taxorixa.pdf
    • https://greenfuturevietnam.com/Upload/files/95935439904.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c874a07---77467797175.pdf
    • http://phelieuviethung.vn/upload/files/94760100087.pdf
    • https://hzautomatisering.nl/userfiles/file/xinodarisigubife.pdf
    • https://travellifeafrica.com/ci/userfiles/files/devuvikidoxuwepijowiza.pdf
    • http://ecohort.com/userfiles/files/gotumilobabus.pdf
    • http://punaide.com/userfiles/files/69334621830.pdf
    • http://rhondachem.com/d/files/17451725102.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/naluvikozigub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hominid+brain+size+chart
    • 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_off0001a669.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A669 16792 bytes
font_01_sfnt_off0001be80.bin
2d90c23ba4b49d44a22cd9e0bbc62c03980352ce5027dea2dccdef0033594035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE80 10780 bytes
font_02_sfnt_off0001d718.bin
4ee3851eeff8b1dc1c94ab6c80652ae4c6f64b2bda58aaace841822aea40e2c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D718 19684 bytes

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