Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c35d4986fd6cb8…

MALICIOUS

PDF

68.2 KB Created: 2021-09-10 23:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd9f28bb102b6a58005345b4b0cd9273 SHA-1: 84c41c07e17ff14fa261094574cab08e41b4d71b SHA-256: b9c35d4986fd6cb84a16ccf0839acf5fd7a2a41bccc7dfb945c3eecff359457c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and is structured as an image-only document with a clickable element, designed to redirect users to external URLs. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cafeau1ait.xyz/js/ckfinder/userfiles/files/sodupafip.pdf In PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/muwufiburov.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/gopufineritowis.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fiwexupewaruren.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/nugopufubajikekazibaj.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/rejofagunapafubil.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/garavesozufalusobagixakam.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/85959205471.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec6abf6ec---malusawanuxalo.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/69573019688.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/eda32de7638f1b98c1d63e69b4908d36/gesugusinuwabenokosove.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/xabawatifabikatofeg.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/bidikupiwuvonevala.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/35310008709.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/xukoradomasadilowoji.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xabolixiposuja.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dijusubuvonatizavu.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/sovitigedim.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/lanurefitoromejizi.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/medunasapopomajowib.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/79764060331.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090413492973499.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/82295024094.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/lodununipuvis.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/38582610585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chrome+45+download+for+androidPDF 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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 14156 bytes
SHA-256: 3898486cc80a99d1a8c7b6ef61ca2365bd98a81280c96c3bfbbcea51ee796a96
font_01_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 10680 bytes
SHA-256: c96408819dc6c981bf462e6f86b422dc5cbfbca771cf43917d461cee17a9627e