Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9df5acf9addf249…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 16:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d08702c5ac30105778a23144d2de0e6c SHA-1: 6e8d310fad3b67e1cd5ec5e695dba75e6da9be6d SHA-256: c9df5acf9addf249b79153ef8db4043490341dc1c07e408cefb33b6e4a2c2d03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ewastexperts.com/userfiles/files/fowupumokagofuxef.pdf In PDF document text
    • http://yuhao-tech.com/userfiles/file/bawesuwugapefakime.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441fb6341e---17109578357.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/virenilopimasetigudiboseg.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/lozelafuwapifaw.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nekoxisemanuk.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tikejep.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/dariwipixew.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396d2f1c8fa---1135436773.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fubizefa.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/bopapefonoroxugogixaleko.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/85025417649.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/sagefugupudikivalakatiwel.pdfIn PDF document text
    • http://tfforming.ru/d/files/rinodopajunurame.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/sivumixugiruvixetotulokil.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/falazakufixowufos.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/93073021286.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/95428326637.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/46549658166.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/78957379105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+change+font+in+messages+androidPDF 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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 17296 bytes
SHA-256: f604d0376345910d4d9833c5b9e99168db11e5702e6b89cf2ed9d6c8fc83c5be
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10956 bytes
SHA-256: 944fff356c47fb91f719f95c2d7b32267d89bc6029dd5945655b6a7bd8e06760
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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