Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ed225e802915f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 19:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72564f1c8451b643f06ec610602a337e SHA-1: decf804470d0526fc3da205494f58796defe4968 SHA-256: 521ed225e802915faa2b02cfb19df6eea46989c5e9c5b822c6e308db3daa87f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The presence of a `utm_term` parameter in one URL further supports a tracking or campaign-related purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://brothers-music.com/ckfinder/userfiles/files/65289723695.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/zovikiferilitiginisuweza.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/6250762598.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23186953778.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rfh0iclit4vcoklo1cmvmaam1g/46183599670.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/kepijatakuj.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/ravifisuzoxeli.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/medomasu.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/69033158525.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/12831502367.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/67373849054.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/gobovadewana.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/nalojugedokemezodidu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/93225791107.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kf6olg4pmdkivnmohrs7fsr3c7/fizafivawewifuvokowa.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109022053514454.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/35532409268.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/tative.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/54694760792.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/turawejesop.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/jolizubusoluvoforu.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210911040129.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/83776978865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=8+ball+pool+hack+chetoPDF 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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 10348 bytes
SHA-256: 26f14203ed46b2aa9ef9f1b985a0313ecd6624fe499c41756f255f57964d5b42
font_01_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 16944 bytes
SHA-256: eeaa49bd3c7ff291d045b119830ef5dc64dc5e43326fc31e55b103f207ca2dd8

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