Malicious PDF — malware analysis report

Static analysis result for SHA-256 390660d6d63a72c0…

MALICIOUS

PDF

97.2 KB Created: 2021-09-10 18:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71fcbf312c621e42d4d096d4a931393c SHA-1: 07bbaf0554abdde94ad3dd4e7c58c86c6da40600 SHA-256: 390660d6d63a72c0d781be28fd60d1a50fb47c80f04d432520b69d33f20f6abc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to suspicious domains, indicates an attempt to lead the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ecoquimica.cl/dinamicos/uploads/file/43727790578.pdf
    • http://goldenagegroup.vip/userfiles/file/28817992365.pdf
    • https://tauthuy.vn/upload/files/lubopesujuxawu.pdf
    • http://hoya889.com/upfile/files/20210909214518.pdf
    • http://w3-japan.com/js/upload/files/lumawaxodiwaxogumiwilula.pdf
    • http://nuuts.mn/uploads/assets/12818275988.pdf
    • https://jamurgoreng.net/contents/files/54385760255.pdf
    • http://studiotecnicomartani.eu/userfiles/files/23134037210.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/630b6f1d298fb8be086f8f6db74f5e06/83340279761.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/bidawolimikopap.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/64982971301.pdf
    • https://hojoairport.com/images/file/91459226552.pdf
    • https://hongmao.tw/uploads/files/202109092112034111.pdf
    • http://steakclubhn.com/campannas/file/surureziwira.pdf
    • https://108pizza.pl/uploads/userfiles/files/latixewojixumigoxobatuj.pdf
    • http://wronba.com/uploads/wysiwyg/file/42142162906.pdf
    • http://airfa.it/userfiles/file/midibavopapular.pdf
    • http://tilestone-pools.com/i/File/63927604141.pdf
    • https://ice-group.pl/userfiles/file/luwedaza.pdf
    • https://mama-light.net/business_school/uploads/file/rizezuburi.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5ps66dh1at4hil8gm4kkneo0vv/fubaxigebizapefojase.pdf
    • https://congnghieptauthuyvietnam.vn/upload/files/65797507018.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kogupenusuvopimexatire.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mallu+kambi+novels+pdf
    • 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_off0001113d.bin
c33309f108a4bb76b519404c8640bf0066d3d342ec55acb1eaeb5884dd3447d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 10852 bytes
font_01_sfnt_off00012a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 16792 bytes
font_02_sfnt_off00014222.bin
2c6f854871c01801626d0620ab939e3011932efefe04c3f89a36589cc555f048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14222 20232 bytes

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