Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e55e2c2c6ba957…

MALICIOUS

PDF

90.1 KB Created: 2021-09-14 01:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2d9cbff43ed1db05e66d5822c37f6cd SHA-1: d7e83ec276cb9ec5c4190267da4a2517ab646b5e SHA-256: e7e55e2c2c6ba957cbda112c25e1779f313e9897f1568bc744be64867026438d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm or phishing campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://beruanglucu.com/contents/files/zupabixavojaxusowag.pdf In PDF document text
    • http://compow.net/ckfinder/userfiles/files/11768175150.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/40794305694.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/papoxo.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/darot.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/mipixekokuwuvakev.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/mafinazuzerorabejisejos.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/botus.pdfIn PDF document text
    • http://pvvc.cz/files/17636768405.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/pibunulum.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/sakiripibisurirawusevi.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/23661636469.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/14671754527.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/pigunugegesufurexudukiro.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef8e9744ab---89382730714.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/kanovobebasinopezilovimag.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/zirarubuzedamupibibiti.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/46868389345.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/14302213754.pdfIn PDF document text
    • http://signauction.net/userfiles/file/67720352619.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/97545217896.pdfIn PDF document text
    • https://shidoremicrosys.com/media/86379658085.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/falimit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fast+and+furious+8+full+movie+free+watchPDF 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_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 18792 bytes
SHA-256: d3d86324f8877e9607ec6615389f2a150b310ee35c1087adc0bcc94e25cfded8
font_02_sfnt_off00014049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14049 11176 bytes
SHA-256: 3945310c2cab916e1eba41cb6d7f68ea4986b838be8ceff171c531efc0f63f4c