Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc60ca132c28ac76…

MALICIOUS

PDF

75.4 KB Created: 2021-09-24 14:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 048ff216e9c0ee4dfb95369b466ba5df SHA-1: 4c7bedbb740ce7e634327f9edb68f4068bc91b24 SHA-256: cc60ca132c28ac76d7b168722853525b23855c8dc6dd6c5b59ffe3c93d5f50f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic analysis revealed that the PDF acts as a link farm, containing numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the nature of the embedded links and the detection names strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://nomylo.ru/uplcv?utm_term=efectum+slow+motion+reverse+cam+fast+video+app+download PDF link annotation
    • https://adproissy.emailingmanager.com/uploads/editor/file/28156469247.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/54608083236.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/22801655231.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59b263b53---6408873793.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/lunafuvates.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/vobeferopuwurusakowobo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/jesaf.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fonabu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/763ebea5aea2aac9ffa4fa2441bbb243/zogejubusigepiwejuzaz.pdfIn PDF document text
    • http://salt17.com/userfiles/files/77610187254.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/89993375360.pdfIn PDF document text
    • https://betsin.org/userfiles/files/fofusoforidasuwafin.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/litimigobavido.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/72879982878.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/78864736482.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/7623944685.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/6351342777.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-4/20210904052730133297.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/89383780557.pdfIn PDF document text
    • 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_off0000ba51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 11016 bytes
SHA-256: cf60de819747e24a3730fdf49dc58812639e49b026c8e0ad3e21511c3076d0c4
font_02_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 19040 bytes
SHA-256: 8eeca1de74012e604d7711ef0975fb460426063a4a0958280fb8aafca12e91bb

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