Malicious PDF — malware analysis report

Static analysis result for SHA-256 934cfd36baec61e8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 06:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8c1a9bab0be1a1ce1964299cd035f0f SHA-1: a55bec8aaad88f94073528a58cd81d81343ba8ef SHA-256: 934cfd36baec61e8cfe2b8e300052aa8d819368dbda91e4064f12e1f84fb40d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted from this sample, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indolabtek.com/Uploads/userfiles/files/58673888469.pdf In PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/viwubi.pdfIn PDF document text
    • http://jsdarvin.com/files/dabemovijafot.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/42064554107.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/wuvevanusoxarezazinigijo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdf9a2b63---wowegav.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/72926293344.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/72869281568.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/98242630958.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/63526514772.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/69248406089.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/46624969509.pdfIn PDF document text
    • http://esistore.be/userfiles/file/mewakivab.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914134137_ryon29.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/89615798796.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/51431364724.pdfIn PDF document text
    • http://contextuae.com/resimler/files/19071509336.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/nimamalazavovinowum.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109040956498907.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/18140153920.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142618e884f8---89735356203.pdfIn PDF document text
    • http://mobitransjogja.com/files/60884990340.pdfIn PDF document text
    • https://netlandschool.cl/files/juvopuvepezotavuxogosemaf.pdfIn PDF document text
    • http://mamitobe.ru/files/file/63202513874.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/sakekukaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=turn+on+my+phone+flashlightPDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 18116 bytes
SHA-256: 6af9d113375b11b72d05a30b42aa09d2597ade9479cdb5b5d4df9e2abab3dba6
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 10980 bytes
SHA-256: a94540c1ed6fbdf7c54e5e8b4caa6fc434542b1c3ae008c1ac06ac989dd858b0

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