Malicious PDF — malware analysis report

Static analysis result for SHA-256 c930d5039dd648e0…

MALICIOUS

PDF

92.8 KB Created: 2021-09-18 19:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ccc6ad9e775dffd93ed2f7869a5acb68 SHA-1: a3085461fb5d74ae36ad657eae1bbca32f6d2eca SHA-256: c930d5039dd648e0546ab6adcb3c7cb3e10b3a2082b1068650a1c5e504819652
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a phishing or link-farming attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://cructi.ru/uplcv?utm_term=it%27s+a+wonderful+life+movie+online PDF link annotation
    • https://sanagustin.cl/files/dedowodevesisijavajal.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/61669613202.pdfIn PDF document text
    • http://idcla.net/upload/files/fokejudesazux.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/52476869846.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vg8osq5sm4soclf1v68e3ot2l2/miwatomabid.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/vuroseko.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ee97d8243---16085479751.pdfIn PDF document text
    • http://ossokahve.com/upload/file/8651892308.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/wogojumon.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109061157089267.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/lakavujaxirosak.pdfIn PDF document text
    • https://simorgh.it/uploads/file/9636621738.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/18933243078.pdfIn PDF document text
    • http://nemochem.cn/upload/files/38531813001.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/nimipipawilewovonirutek.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/10069483498.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/telanozesamedukepulimava.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/46656624096.pdfIn PDF document text
    • https://yasacompany.com/upload/files/kimapomaludamo.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/pevutixegelap.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/wasizawodofexi.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/57015076319.pdfIn PDF document text
    • https://nasikampung.info/contents/files/14742120389.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_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 10752 bytes
SHA-256: 3c5969158a397b8960f072fa7cca59e94aae39a2c020180dbf0c13b4133b257c
font_02_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 17536 bytes
SHA-256: be08e598f7acae00ee6cc5c0c46da3e91dcc6f57747f013bbd98196e287ba80b