Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5061ec28814cc36…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2be3d323c173fb87dbe6cac5c630412d SHA-1: 830256f1193be7b0a22c18f0df8ee81ae345594d SHA-256: c5061ec28814cc3699e3f380a437459c6aa4395028d1c0bd5c40c4bf5f1be6d4
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier strongly suggests maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nijosibowefefedegamiki.pdf
    • https://lazeo.nl/userfiles/file/2293952385.pdf
    • http://telegid.tv/userfiles/file/leselurebagomuzuwa.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/58184823574.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hkkbp0e9mm5c1fe1eljebr9tbk/zonadijixojed.pdf
    • http://goraku-sangyo.com/userfiles/file/buvorilasamononofum.pdf
    • http://baobianhkhang.com/upload/files/61780420672.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/26571421666.pdf
    • http://gelikonline.ru/content/Files/39396979339.pdf
    • https://bustotoronto.com/userfiles/file/12841917872.pdf
    • http://burfel.ru/upfiles/files/xawujimadubezimamul.pdf
    • http://pfmconsulting.org/survey/userfiles/files/dipasozarepabope.pdf
    • https://fabriziochessa.it/userfiles/file/59369671749.pdf
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/lopedesip.pdf
    • http://yhbinternational.com/userfiles/file/68421713841.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ed6736c10db78b4f1f5707b79afe6464/36285209721.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kosusowidubajo.pdf
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/88204349422.pdf
    • https://maurinet.com/userfiles/file/rewaga.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/25321629031.pdf
    • http://www.s4b.nl/upload/files/95234716813.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/rixuso.pdf
    • http://optometrystaprzemysl.pl/userfiles/file/54208681416.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=measuring+volume+worksheet
    • 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_off0000ae09.bin
442f67899badb6eba97788e0705a7e7a47b9ac4ad2fdbe03c91bea3af2e9083f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE09 10892 bytes
font_01_sfnt_off0000c717.bin
422036a1339d6dfc86f5c502fe259c809a76bd8976dfc9c5bbfdc930867103e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 14756 bytes
font_02_sfnt_off0000ebf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 16792 bytes

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