Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412a495122b59a3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 07:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec7493d9dd65395874087ef1f99d5f42 SHA-1: a68a7a7a73137a4fbc2f83f9f942b2dd189abdba SHA-256: c412a495122b59a3150f72595c031e4c3b615a4f14f537cfe4db88133c0876f0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac4340fdf---78799237056.pdf In PDF document text
    • http://ildongwire.com/userfiles/file/17668926405.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109161806362747.pdfIn PDF document text
    • http://kes.org/upload/editor/files/galug.pdfIn PDF document text
    • https://trieurodata.ro/images/file/senijedoninox.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/78477088781.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/xubepakabewirevi.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/51002669777.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/65810712433.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/58520242732.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/nozurenufosa.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/22247605602.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/28628325615.pdfIn PDF document text
    • http://jaqalsports.com/files/file/66774040829.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133646819549---26573187425.pdfIn PDF document text
    • http://mobilenmr.com/files/files/60012654819.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/jubimes.pdfIn PDF document text
    • http://www.bash.cl/media/file/lewakodusuxiwumimovol.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/gabakaxigatob.pdfIn PDF document text
    • http://consade.com/userfiles/file/40295778961.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/52559111658.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/7911969764.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/11907318553.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/33329214475.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/wupotuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=version+for+androidPDF 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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 17536 bytes
SHA-256: 918591f8562c24c658fbdd1868d1b97646e7024a9f2ab60972a1bcee30665d3e
font_01_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 10172 bytes
SHA-256: d32eca59ac52bc4b76f907a4700252e2bcae3e8a7fab93e6f6af8b3ba99f740d
font_02_sfnt_off000133c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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