Malicious PDF — malware analysis report

Static analysis result for SHA-256 490d0e09023a7ad0…

MALICIOUS

PDF

100.0 KB Created: 2021-10-14 04:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a9a832cdc8e1633d694f31e93c1589ea SHA-1: c47dc7cb8003b5149e30d8c272ee35fb29b176bd SHA-256: 490d0e09023a7ad060ffaef2aff809febdf3f0b2ff2cfa74d3906dfd3d4f6a43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://plentis.eu/ckfinder/userfiles/files/mujidamujiwosozirajob.pdf In PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/55399865518.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/8216765381.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/17651195332.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/rovikagefeva.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/66998906035.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/4093170786.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/21608342378.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/nofiregefarexobup.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64640408380.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/wipisufakibopozapeloj.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/fowutekin.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/powuborupebasa.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/80324932717.pdfIn PDF document text
    • http://lobi.md/userfiles/file/84208403071.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/22716449940.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jekegovuvukejom.pdfIn PDF document text
    • http://gazetavk.ru/img/file/luvaven.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/81551890573.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/kobusususuvuzedofinez.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/48008674878.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=capital+gains+withholding+clearance+certificatePDF 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_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 11016 bytes
SHA-256: 37ac5b38ae1ee5beee0f790501b8f29e153b8389be40126bc4c7db9b6bace5f2
font_01_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 20028 bytes
SHA-256: dea0c70cb72ae4bcbe588ae5a48a4a7937b9ec2544192afb6bd33683012cec3c
font_02_sfnt_off00016a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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