Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4873f3d75484f3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 08:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a48a303bdcd15096c9f0861a0c623d6 SHA-1: 2db5f4a293548837da906c49c7381c3acaf128e0 SHA-256: cc4873f3d75484f3da1d3aace6c0405b625e057a25a703df1b24119073c47658
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, consistent with a link farm used to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cuoredicane.it/userfiles/files/84693899031.pdf In PDF document text
    • https://catbasailing.com/upload/fck/file/91244735964.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/nirozajagapenunoxej.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feeb15e1c8---12523294010.pdfIn PDF document text
    • https://producto.works/userfiles/file/wisis.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/64351161083.pdfIn PDF document text
    • https://blv.by/upload/editor/files/21458102914.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/22203554360.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/sulaxasebuloxivoduxa.pdfIn PDF document text
    • https://netlandschool.cl/files/1588493896.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/dibeb.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/dizivonukijobu.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/94956882070.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/94866786642.pdfIn PDF document text
    • http://www.polni.si/Images/files/51717542960.pdfIn PDF document text
    • http://parfumland.sk/upl/rudujebuniwavofarudif.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/porakamosesifalos.pdfIn PDF document text
    • http://leeandrewdavison.com/download/kibiz.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/8466122194.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/ravated.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexiwepelovixawibigu.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/bokeni.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091108471073499.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/dakezigusabajozon.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/laxipojawuzet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=change+android+to+windowsPDF 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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 17440 bytes
SHA-256: db67392b65f6692c42cb728e8940c873395b6bd7d88b2acbbb822706cee42e29
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 10596 bytes
SHA-256: cb63d08cce4315fe2426ee0e62265a7fd659229d998036783451d526533842d0
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1