Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2c82c56f943475…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 13:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c7fb4f6a0dbf89514f956dc30ff846b SHA-1: bda1b20a5775303cebf4cec8bfc9f26f2a13212b SHA-256: 2d2c82c56f943475a9b1699ff491e422e49c160d75de1e968feffc7743fc0a94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://saptabangunmanunggal.com/indomobils/upload/file/fosenexumubideput.pdf In PDF document text
    • http://centralgiving.com/media/userfiles/file/batedigomefi.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/46598552928.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/14754308268.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133950757435---mofefexojarotovoxezu.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/xisetavutopupi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16220753996.pdfIn PDF document text
    • https://kuepancong.com/contents/files/furakofaxenaneduxugu.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/50723756923.pdfIn PDF document text
    • https://okazionche.com/files/wuzoretuw.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/60651606070.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/befugoxek.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/75259472912.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/38453361516.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gomuwifufafuzige.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/jifuluzo.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210910/2253044860.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/15486999546135bb5275316.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fb510ab6---52126760139.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/takezesugenij.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/83287480176.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xavegifaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sky+share+apkPDF 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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 18428 bytes
SHA-256: 472b8d48f386ff84c074a7a0b4e13256c07dc8e31ae3737b9354adba27820f97
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 10168 bytes
SHA-256: 59350d82a160a783edea7a4e0833130244c43e115e9d40edc5e6909998a13a92

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