Malicious PDF — malware analysis report

Static analysis result for SHA-256 5500d55658bc6097…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 00:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b526ec6c81b22564d3aec7f68326e33d SHA-1: c741bda5c760f1df7f2c069b7fe5e8d30b6d6d04 SHA-256: 5500d55658bc6097ce5a8ca116cc50e66726bd39d8704336726001ea8e3f33cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, directing users to numerous external URLs, many of which are likely part of a phishing or malware distribution infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ginzaramen.us/uploads/files/7282860695.pdf
    • http://hzqzg.com/d/files/sevinomaxifud.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d4a66e7---lufewadegubupa.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60055146750.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rolinivoniriletori.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/29108940691.pdf
    • http://gurukripapublicschool.org/userfiles/file/tevobobemitijas.pdf
    • http://ucg-eg.com/userfiles/file/nakugatu.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/kozokisakupeja.pdf
    • http://kotrackusa.com/fckedit_file/file///20210901_8_17_47.pdf
    • https://papiratisk.cz/soubory/90463701065.pdf
    • https://giaynangchieucao.com/userfiles/file/vupoma.pdf
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/lobufotanasudibevemoli.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/xozulomikukivexagakorenef.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133881b6d01f---tuvepositisidegin.pdf
    • http://leprofit.ee/cmsfile/contentfiles/42209337579.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jivovitujebutujetuvo.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pojipapebitotusenozuz.pdf
    • http://liveranigioielli.it/userfiles/files/81742186148.pdf
    • http://alphasigmaoverseas.com/userfiles/file/xevofukokuvumaxidawin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=need+for+speed+no+limits+download+apk
    • 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_off0000b368.bin
67e7fb30347622e57c58baeb865e68369466b9ba5c5665f9d47a343600032629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 16592 bytes
font_01_sfnt_off0000de55.bin
018277ce45b754fe8a479337762f4b2918e39b9fa69f80c6fa33aaf49df11af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10816 bytes
font_02_sfnt_off0000f74d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes

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