Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9666a71bc778d70…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 15:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 583c4821eddb3056a124e142bdf10beb SHA-1: fbef4f80ed90bfe206ee669645bd5c7e9aaf9f52 SHA-256: b9666a71bc778d70ec3c14d11b9541dfb7d8785feb12cf20a00c47a5452d6afd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ltpbetel.ro/userfiles/file/78707024671.pdf In PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/gijolekamasusuwi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613200a96e04e---loxad.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/fifana.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/62180975664.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/40466409012.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/92243028553.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/88814699245.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210909094134.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c819b772f---74837328704.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/papamipinabujuvazata.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/52910092210.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/57683471678.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jakitozexakagolez.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/2666813135.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/86760391915.pdfIn PDF document text
    • https://songhongresort.com/img/files/85875309088.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/sudinenez.pdfIn PDF document text
    • http://lse.hu/userfiles/file/15583007234.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/mutoxezijasipojaxog.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/sanulanepemowogesolob.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/39450534260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+apps+from+play+store+without+internetPDF 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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 17240 bytes
SHA-256: 7d2c75476d6f5c9e5bdd9bfbfa989db334165d97ba31295ab14703fdb0d30e7d
font_01_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11056 bytes
SHA-256: 47056a282c9c64438a94eab1583d4d3e3237d01f623fb4c426428326525a43cc

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