Malicious PDF — malware analysis report

Static analysis result for SHA-256 276a5d3889ac0765…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 07:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cfcc04429b865cfa9c254f3bfe773aa4 SHA-1: 89ff5b862c6e2ad6c2739a588fb678d3e81bffaa SHA-256: 276a5d3889ac0765d07edebca0788cf7b17610aa19d07e3ae94a95ecafe9e106
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojanized PDF. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://toscanafantastica.com/userfiles/file/zozuvugolutejoji.pdf In PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/silivogezizogok.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/nerubewuxa.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210922201745290.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/siliw.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/radoguwulabiwekaf.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/82005933269.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/wudivur.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/97276706086.pdfIn PDF document text
    • https://gilbertems.com/videos/file/welikotuwuwofu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xomatewofawatog.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/62917249101.pdfIn PDF document text
    • http://rentaruedas.com/files/others/84076158370.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/92718617191.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/7796336814.pdfIn PDF document text
    • https://panama4d.com/contents/files/71408213739.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/7421652577.pdfIn PDF document text
    • http://olympusflights.com/files/files/migegugowiba.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xuvopazujiwozazufogiwemu.pdfIn PDF document text
    • http://metallpress.ru/files/getudiwupijikovip.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/40100753477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+illegal+movie+sites+2020PDF link annotation
    • 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 17064 bytes
SHA-256: e4a36dcb99e37fc31ec737b647d03841cbf5429fc74cc6969c48b81841d350ec
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 10608 bytes
SHA-256: 136df00f921fddea362e0589df14756de2622dc16b1b6a1e7e558cd837d10c0b

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