Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db25c970a3ffec2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 04:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52286b5f061ffd02e26f3de69a7ed3ab SHA-1: 2ebb014e2a084149cef87dfe817ee672565b71eb SHA-256: 4db25c970a3ffec2c6eae4742cb5e095aff33a0007d4847d3127e90049efa610
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ggmtc.net/userfiles/files/65574492793.pdf In PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/keluzutug.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/11518014784.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/53880520052.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/103901504.pdfIn PDF document text
    • http://koddous.com/userfiles/file/67225378704.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/16274790617.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/91303051669.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/jidazamobawo.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/98256173373.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/fiwibax.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613811cfb5311---15141600955.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/xubupokanegelekaregadipu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139632a9a2ef---maxopuzuleze.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/tuwizid.pdfIn PDF document text
    • http://rts-3.ru/upload/files/febanikiworufet.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xobevuwadupesuwub.pdfIn PDF document text
    • http://epicridesnepal.com/files/fodadadupisulixuxipaw.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/towomegadotadukexidok.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/49446677330.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/kerepiluzowovurekuvimaja.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/tipusavodutulanotize.pdfIn PDF document text
    • http://wuchem.com/upload/files/doravedizugunapesilaf.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/25148141788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=different+volume+for+different+apps+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_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 10828 bytes
SHA-256: 333710bba76ce5981a5faa28c0b209b7c67f776a0f5c7a5aeeeed80a65f2c462
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 18056 bytes
SHA-256: c6d416b789650c861679854aa6e92b3d1057cf41fbe92308a61806b5c024b833
font_02_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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