Malicious PDF — malware analysis report

Static analysis result for SHA-256 452b664a9c669b36…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 20:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 484f9a1f9c57f8ad27d89f9ba4ddd42d SHA-1: 65b47e666c500eaa1e79d46faa0abc30e84e2a00 SHA-256: 452b664a9c669b3632c20f2e1cac11b2f12d422ac483421d8356e9d7d9572ccf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are structured as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites or to engage in SEO manipulation for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.web-globus.de/ckfinder/userfiles/files/12320434522.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/18900462123.pdf
    • http://autoscuolapezzano.it/userfiles/files/1816752994.pdf
    • http://changrung.com/ckfinder/userfiles/files/menegifemusekare.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/wowosur.pdf
    • http://inggeo.eu/userfiles/files/janipisoluzewujep.pdf
    • http://malopolskiszlakwinny.pl/upload/File/18876097186.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf95d2faa---58047204600.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/65846449075.pdf
    • http://truhlarstvisollner.cz/data/file/jogufibafoximatesupelalu.pdf
    • http://makaroma.fr/upload/file/25531063569.pdf
    • http://savalis.ru/userfiles/file/koloxarefewosirufawerex.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/sekefufobugegadujewisugod.pdf
    • http://crosswaysrecruitment.com/userfiles/file/93718448916.pdf
    • https://monyetmesum.com/contents/files/wawesopujitorumafizuf.pdf
    • http://salman-is.com/userfiles/file/39234202709.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/konekazi.pdf
    • https://barcelona-health.com/files/galeria/files/37526862021.pdf
    • http://xhzhengli.com/upload/jajudusokudodezom.pdf
    • http://vetportonaccio.it/userfiles/files/40724371773.pdf
    • http://steffis-strassladen.de/userfiles/file/90032508827.pdf
    • http://southerncross-ex.com/images/blog/file/jaxawezomima.pdf
    • http://hsaltsj.com/uploads/files/runikilokemobijok.pdf
    • http://statsale.com/data/upload/ck/files/17294407156.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+auto+messaging+app
    • 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_off0000ec36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16792 bytes
font_01_sfnt_off00010448.bin
cb1761ba0b00c0dcea091a76fcd6d30fd1212fc9a06cd129c36b0c652ab6a830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 17660 bytes
font_02_sfnt_off000131f5.bin
ab5902b2bc5ce71d43629c0a4ca04279b47babd7317d0fd2ef6d1fdeb134a3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 10772 bytes

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