Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d19de31e5a7876…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 08:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ab4ed273218b0de7a898ada66916f80 SHA-1: 74526c593aadf581e402ae8dab13351e8d9a2187 SHA-256: 91d19de31e5a78767ca47ad7edb5ad6c1885bb942adc7f7656400c196dfe37ea
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent to trick users into installing malicious software disguised as a browser update or extension. While no scripts were directly extracted, the presence of multiple external URIs, including one pointing to a raw IP address, suggests a potential download or redirection mechanism for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://detectiveoffice.net/userfiles/file/betubeguvutofupuvudini.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f078d7440---kononelepebemotawotozov.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/58680131185.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/90222516430.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/pivof.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pafowatet.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210907151505.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/51089778750.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/24236965590.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/99019562835.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/44073676917.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/fimaz.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/30648047993.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/befigiwajawifar.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/zilobibuda.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///22936718444.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/48968736055.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/demasutulorenulir.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914040747_sjekk7.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/29801905728.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613b73063bad0---xisabowokajo.pdfPDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc7626e2b---zamerevibopuveloburodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chrome+anti+adblockPDF 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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10728 bytes
SHA-256: 4223bda8cc1444867260b1be5084b069cea802fcd50d1ede9daabcbe6e04b919
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 17740 bytes
SHA-256: 324e1f33d3a5ab802846c4a2a218d274c420a9607bb24d53b389319b454ac867
font_02_sfnt_off0001220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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