Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f268403f95f943…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 08:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 919121de10a1fabc7de05505a688685e SHA-1: 5c34397c59d765193481b4a17df8fc9e886cabd5 SHA-256: c1f268403f95f9436a56763aba5feb3dc598dcccd4e933e16b1695d2c83819a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on suspicious domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mengnuanua.com/app/webroot/files/files/13900752051.pdf In PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/39052042579.pdfIn PDF document text
    • http://canadianrockies.info/files/file/98560238966.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/66397350947.pdfIn PDF document text
    • http://tfforming.ru/d/files/rinodopajunurame.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/76131458949.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/39162128745.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/63275134114.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614134039a9a8---29596801786.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/badaxatalokeruguzulekon.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/98842759744.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://afra24.com/basefile/afra24/files/75472210189.pdfIn PDF document text
    • http://sushi-belovo.ru/files/36161916237.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/83786539888.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/44510341582.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/89681667233.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/jezowizolubibefuza.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/54559293216.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/13481523302.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/78959989770.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/88755709673.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tugiboxuzakixudadutakod.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/28564016147.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zugiluguzojope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hack+wifi+with+rooted+phonePDF 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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 18088 bytes
SHA-256: 20845abecbdcb9dd98fb91f1e8f02286a7ce263f1f10acb9edf05556b535144b
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 10672 bytes
SHA-256: fe46428a8903e9312ae66076b94bfdd656a7e526e5cec3977477c254fe7528c9

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