Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6cc18a49b1ee8e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 01:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7d3ba4ca979e72dedf10e9f8559e429 SHA-1: 30e5a17bb22aeb20b9d30e07089291788ed84c14 SHA-256: 1f6cc18a49b1ee8e15b74217565267e58df509f364c8a4e78f8892a5ce8189eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fli.edu.mn/ckfinder/userfiles/files/52199245183.pdf
    • https://strechybenesov.cz/content/wozupejirumeligogebomijex.pdf
    • http://zensushialiso.com/uploads/files/1773148216.pdf
    • https://togeltop.com/contents/files/vesekakuwilete.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/robetisozetojub.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/43794377354.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/68287751890.pdf
    • http://www.painters-restaurant.com/userfiles/file/71420090661.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/71376970232.pdf
    • http://sportschoolindex.nl/images/uploads/walepotazorebenodafo.pdf
    • http://aaz.sk/editor_uploads/files/pupewobofexe.pdf
    • http://househouse.it/userfiles/files/besaxagekukidixizutu.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/51365956360.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/37400555264.pdf
    • http://quatanggiabao.com/images/uploads/files/perizenileroluko.pdf
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/97652316352.pdf
    • https://wfca-czech.cz/temp/userfiles/files/mujudiwijodilowubaf.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6602eebb---68858319289.pdf
    • http://whkmradio.com/userfiles/file/divunuwakidesesakurisobi.pdf
    • http://blankheich.de/images/uploads/file/64145552252.pdf
    • http://liebherr-tr.com/userfiles/file/sevorulegilolajovemiki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+phone+bd
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gabajigow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB0 16792 bytes
font_01_sfnt_off0000c4c2.bin
2e160b9a9d2820a19052cd03bf99b46a9db3293d1361128c2e3ea53c17886798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 15336 bytes
font_02_sfnt_off0000ebac.bin
0d156015df354c4eaac1bb10dc7c24c7db490269487ff21cd0ab5ca79af0d3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10284 bytes

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