Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a4503baeca2585…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 13:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72099781f0d52efc93f4aee2e4dac312 SHA-1: 4f0901eeee879f13c4ec212dac7c6dc073adb2b8 SHA-256: 38a4503baeca2585f168425c1ff710af9dc153a6973df78326b267c62a94ccb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable or unknown domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mibenjamin.com/userfiles/file/setagipodesa.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/dizupufudulukuzidowu.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/debibuwodubi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73094037171.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/muzusiz.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/nowife.pdfIn PDF document text
    • http://metallpress.info/files/ponoxawore.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/97427085100.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/vuginov.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/96053615563.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/fataxumo.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/49175608253.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/69960185657.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/waxag.pdfIn PDF document text
    • http://progetec.org/userfiles/files/86732997584.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/nakavesolajufivi.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/zukewadaber.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613992e24c814---mezoxiteraxawapijoloniw.pdfIn PDF document text
    • http://maksimetall.ru/files/29881386868.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/28247028236.pdfIn PDF document text
    • http://manu-transport.com/documents/file/pibigapefomupotujafib.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/peketomidovojaferelin.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/tevofazaxofojogaxoni.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/mikojikabefigasuroxanixa.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/jugivawasege.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/38784326039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mirroring+screen+android+to+pcPDF 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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 17960 bytes
SHA-256: 409daa8d077f257ddabf07b6757daef287b1bc0293c1c05d1f3d43fdd4ca0156
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 10636 bytes
SHA-256: b10246446b9db9b1b192c9b528ab1df5f57d288bd565d4560f2e3078c8fe5c36