Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a9f9351fe4a8b7…

MALICIOUS

PDF

68.5 KB Created: 2021-09-16 00:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88c414febf492e57f6f2dd833f9fcb5c SHA-1: a2861af31ddbad62bf183b50f4b4563aad0bf7a7 SHA-256: 62a9f9351fe4a8b796605b06a42a2ba356fe82a45975558dcabd8b5e1da474ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, many pointing to potentially disposable domains, suggesting a link-farming or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://esofagopisa.it/userfiles/file/2080024104.pdf In PDF document text
    • https://istanajpdua.com/contents/files/fetewujali.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vexexobivaxebifuxugovemo.pdfIn PDF document text
    • http://riversedgefm.com/files/file/pewigevokawuwimuv.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/vizalemix.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/logukajuzobaxo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/lomarogepewuwajibi.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/28097218922.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xusufidapuxelox.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/92515586045.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/33488443512.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c0b82a8b90c19ddd4f50c4b948fcf351/bazulizavikabomisul.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/zipuzegise.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/ravabatojawe.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/sutonoduzamorezidilejika.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bagavi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/paludalanazox.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/57172414871.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/xevagogixirugikumu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8a6902ad---pekudogejirigemipumereguk.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901150014.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/56389491849.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/25401160277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=retrofit+adapter+rxjavaPDF 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_off0000af46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF46 14256 bytes
SHA-256: dc5278b253d85e61d1a413e65425cd454d8a4a66c5a6d3e9836b3e4bc746fab9
font_01_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 10516 bytes
SHA-256: aaeb58fe6d17a23b466b52645d3b6d876f617987579d4ff56c6d30c1a99688ef
font_02_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.