Malicious PDF — malware analysis report

Static analysis result for SHA-256 399922a383a3b228…

MALICIOUS

PDF

71.5 KB Created: 2021-10-05 04:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ceb500add90a8410cbeead52e657b343 SHA-1: f76b094f60ae35cc8c84e5107a66dc125593f1fd SHA-256: 399922a383a3b228830ed58758ab901304a82dea31d511c05a333ecb65e85613
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, with a notable heuristic indicating it's a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=exercise+for+a+healthy+lifestyle+should+be+done PDF link annotation
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jafejozesu.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/15500989585.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/wonov.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/pukezububinopukope.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/49880591568.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/18501999677.pdfIn PDF document text
    • http://maksimetall.ru/files/94149719709.pdfIn PDF document text
    • https://yasacompany.com/upload/files/rutokagopu.pdfIn PDF document text
    • https://banifatemeh.org/data/file/65059404680.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///59857869570.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/tadidowibepa.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/73511248475.pdfIn PDF document text
    • http://atputasbaze.lv/images/userfiles/files/71744030661.pdfIn PDF document text
    • http://manenshop.com/upload/files/84656242686.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/94238287326.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/telexokenafixunodofof.pdfIn PDF document text
    • http://npas.ru/pic/file/nefatidobojit.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/77610155766.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/73600858312.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/85235774527.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20211003114524037.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/34290444324.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/63503195324.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161427b4d2506e---fagavusakanujefez.pdfIn PDF document text
    • 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_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1F 15664 bytes
SHA-256: ff2d409a137f6a0e87e0ff97cc3efb81bafe5f0038629d882c58a923f1c708d0
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 11012 bytes
SHA-256: d117e21fd3113d0b3cc732b5fff8d48c6f193df6ec9c50e307d4784a7de2a057

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