Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b05fc8bb7add228…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 02:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 476b71d7b998b06a3bdc75bb1b2622d3 SHA-1: 3a4319e9a16668b7231d8f7e6ec8c3d66301915c SHA-256: 0b05fc8bb7add2281387c4e60515bf171fe6c5bc9bab6badab085979775765d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs, many associated with link farms and disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://catamma.ru/uplcv?utm_term=free+download+kiwi+browser PDF link annotation
    • http://manisafar.com/basefile/marcosafarir/files/gelumowewakurorezuwisareb.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/tonuwaluwedemop.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/42922888975.pdfIn PDF document text
    • http://spbi.cz/res/file/67672504508.pdfIn PDF document text
    • http://webursitet.org/Files/file/18733521619.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/ritigekevenu.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/16521501839.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/5456727346.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/tumepowuvirepuzegufalat.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/21572383467.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/xujatizemamitu.pdfIn PDF document text
    • https://jagominum.com/contents/files/nagofi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0mfu4ea7m5o60o3oossemk82q6/kazudex.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/90084762829.pdfIn PDF document text
    • http://asvpp.fr/pdf/wubizanog.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/12991680155.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/50273973810.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/09/50299559346.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/votutujo.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_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 10436 bytes
SHA-256: dffafad856b1ddf3ca7ecbb969bbf6b2f7ea4c1f274dccd23f0889fa0fdeed7c
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 18272 bytes
SHA-256: 8dde963e77dcc808e70f928a185dd87dd4e405fb440d0228aeb2631d9b884567

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