Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd70b16ad531f3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 21:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8f06329053b424c035738aba3d539ab SHA-1: f8293533e655c8700556d702a9a224914e5d9cbc SHA-256: 12dd70b16ad531f3358400f0b1d2e06823d84eba478056045a030d9cb3eef723
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0153f18c---nazuzomesepoviju.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/12706562144.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/23170707905.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109081916468824.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/2811056369.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/7541496247.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/jijenuzemopujafifepek.pdfIn PDF document text
    • http://sgpeo.pl/users/file/84893875257.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/66163696179.pdfIn PDF document text
    • http://decorstore.eu/upload/file/wikifot.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/fudepelubu.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/63080672163.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a8f39f2b---54892844918.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/67170712826.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/livupefol.pdfIn PDF document text
    • https://begili.com/uploads/image/files/nuzevun.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/3901484681.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/78011410628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sefan+ru+android+games+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_off0000bf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF09 10964 bytes
SHA-256: 8c1fe712d45f2200752699832cfb62d787b01af5df0747dc2f7838b42a5d9ce0
font_01_sfnt_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17956 bytes
SHA-256: 2acf0bb8007b1996d35801ab94dc63cd14897521b204e878637d2e351475a736

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