Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aabc2499d414c09…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 02:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 018e44988223ba4ac2fd4cfd6a136d6c SHA-1: b6e656b1e979f9b9dd61c38f16ffe47d192a9ab9 SHA-256: 2aabc2499d414c09a0e068e71d3ad9518f431264baf264a3174268d3c32993b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several URLs were extracted, many of which appear to be part of a link farm, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=free+nsfw+games+for+android PDF link annotation
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/fawafomo.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/6425699929.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/42552081560.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/wadefitodobal.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25408035804.pdfIn PDF document text
    • https://ismart99.net/upload/files/bonexoxupalemiwuku.pdfIn PDF document text
    • http://cga82.com/admin/File/23460739991.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/11156757928.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/levejetenojofe.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/73377239838.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219111317581970.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/makominezafabeginoze.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/doxizok.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/xewipevepupewufeguxet.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/86319388106.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tupunajixituzifekowomez.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fakojobedulaxebum.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/4477269662.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/96423539083.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46045153703.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109181737295649.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/vopuposoxibowasode.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/ruvafos.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a52821ecd---53475298122.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/3564148388.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b41f38ee6---22908755909.pdfIn PDF document text
    • 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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FF 10616 bytes
SHA-256: 5426cb679d2459ee27fc0be580a6847e3121148affcb88630e6a94006a478a35
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 17172 bytes
SHA-256: c6c42b23cfeb09f562cb9cf0ac8f615a35a2c9ff520eb208736ba0ccc4b1d1f8