Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f06bb7ea5f8283…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 06:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 195a0ae3a89b6044e4b379883dae263a SHA-1: 64fe9587be77d73bf6c1689d3d889874c21d3548 SHA-256: b1f06bb7ea5f828344725659b0b28db2b8852181b5c66299a817de083146f636
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution scheme. The ML_NYX_PDF_MALICIOUS score of 0.996415 strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://elfuklid.cz/foto/Image/file/masawa.pdf In PDF document text
    • http://yuli-china.ru/d/files/82168827229.pdfIn PDF document text
    • http://anpharma.net/upload/files/dolopetibinagexa.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/90906087719.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/34456021871.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/pimekajudedajuperafug.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/zixoviwuxiderebebebugoj.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804fd215ab---lezegatojetefexitavok.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/monimop.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/wokabalopifumepen.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/53089814672.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/siluzin.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/zinixojukojukujogej.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/14376440659.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53864682177.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/7400055536.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/56271321075.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/sajaxir.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/dozifebada.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebili.pdfIn PDF document text
    • http://dgkno.cn/upload/xenojopuzazirexuwurofijoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lesson+2+graphs+of+quadratic+functionsPDF 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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17888 bytes
SHA-256: 0c55498e7f91cc71dd34e544ddc78c2254fe7fd8bfcb1c367fb05a1786d19326
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 11176 bytes
SHA-256: b8b79c284d02fc0a01aa480f8e1944a1070f8a625a03fedc1a574d0c42c5932a
font_02_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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