Malicious PDF — malware analysis report

Static analysis result for SHA-256 1686ac7bcc8a4319…

MALICIOUS

PDF

68.3 KB Created: 2021-10-02 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 92bd70a1a3dfab1bd6b26944d7010fc4 SHA-1: 2326d82b9c79954735337825ba2dd2c64c49eb64 SHA-256: 1686ac7bcc8a43190d2ddad6145be980d78effc2c676c7f1a34f90d3b78385a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm with numerous disposable URLs, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://lukinserv.hu/file/74678340122.pdf In PDF document text
    • http://locum-system.pl/userfiles/file/fenuvivonugosuterida.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210918120156.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/bifupezuwupozifes.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/71290438246.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fojoxuvamamunelakop.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/golasufoperigaxufipiwu.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/24590243840.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/30496367345.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/befatekefo.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/34365723345.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/50202227011.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/72873507299.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/52911094547.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/wumuw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/09195349916.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/45032bd2e8d628541be10aad53a82edf/valun.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134192f64aa4---61948702159.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/jonugetuxeziwevo.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sigurewutiguv.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/59289461573.pdfIn PDF document text
    • http://jawarakreasi.com/file/jejokeketopudo.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/54608344069.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/jipunudenogakigulixawefaw.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/suxavito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+croods+release+date+2020PDF 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_off0000affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFB 14184 bytes
SHA-256: 6443ea55badee48bb6af6099c2d0811cfe6a9b844e716ff35ff14cb7b4305927
font_01_sfnt_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10476 bytes
SHA-256: 589d020a46b0e6c46670e36c26373d7d4afbf10e277473c7809d7172b4b08e40