Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c6c1d9a17cac45…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 23:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bad3d69c5fa9aeae7abfe98979c7bdf SHA-1: c6cd7b2844ad680a002ba6dcf400267734a5e291 SHA-256: 50c6c1d9a17cac450f88629d9ae2f983cfcc58c8a5b40c89294dd34bb538a3e4
146 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of external URIs and a link farm on disposable hosting points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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 http://caythuocnam.org/images/files/44698786027.pdf In PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/11945156621.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/97511823694.pdfPDF link annotation
    • http://sbs-group.co/userfiles/files/87511797632.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/48469009586.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/78109495361.pdfIn PDF document text
    • http://devveb.net/userfiles/file/zurazusonumumubejapagi.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/mavuzupaf.pdfIn PDF document text
    • http://scsytech.com/upload/files/48309333740.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/tasazoponexela.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613690524ce47---gobovoburuvoresafo.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/puwija.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/76319699539.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/1679475032.pdfIn PDF document text
    • http://shopabrang.com/images/files/13859882080.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jet35qca6ip2g26bbhtadfnjta/lenuguxarafexomimagitinu.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/lomenubumasofi.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/zafidupesibomugomojotadu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/pisonagep.pdfIn PDF document text
    • https://nevisnews.com/userfiles/30577425921.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/46742431016.pdfIn PDF document text
    • http://otczenacts.com/media/files/74105790958.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/74147005551.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/31896985474.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sizisaludewixakuxivivi.pdfIn PDF document text
    • http://medica-brno.com/files/jovitem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=candy+crush+saga+old+versionsPDF 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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 17772 bytes
SHA-256: c1a317cf48b4af7eb77d713699939a0675ce006875997de7075f7ea158d3928b
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 10864 bytes
SHA-256: 048e74d06c18a60497c033a0eea529f4c2e2c7d893cae6e280cc1cd0361f5de5