Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae5c014d30d1a00…

MALICIOUS

PDF

74.1 KB Created: 2021-09-23 22:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39488cd22661ed094934e23027d38b10 SHA-1: e201b021f0b8aed7463bcee9bcbf79052bab1305 SHA-256: cae5c014d30d1a001827842e839bbda97a47acc71cf7664b92506f766c466e02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and a link farm points towards an attempt to manipulate search results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/suvud.pdf
    • http://vtaky.sk/media/file/buvegopak.pdf
    • http://pho32shabu.com/uploads/files/64601080830.pdf
    • https://bongkartuantakur.com/contents/files/75079058050.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/tutigizuxorererojajes.pdf
    • http://eros-arena.name/eros/userfiles/file/82565827848.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/nubonikikegerasokul.pdf
    • https://kopari.hu/files/file/19608301526.pdf
    • http://insuralead.com/userfiles/file/mokufirobuparezetuva.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/90745510880.pdf
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/2125534803.pdf
    • http://amirafouad.com/uploaded_files/file/wurerufi.pdf
    • https://fabriziochessa.it/userfiles/file/50318429806.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8r8m95rfahi4rr9q71mg7v7oj5/kirozurowusixujurawin.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/mifafomova.pdf
    • https://berbagiangka.com/contents/files/41411163019.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34911947187.pdf
    • http://mfcpavpos.ru/file/90386164558.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/dokuwuxuwoludi.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/12080264084.pdf
    • http://fatimaartwork.com/userfiles/file/20646649188.pdf
    • http://vitalchurchesinstitute.com/files/file/jeradeweber.pdf
    • http://redeyeldn.com/userfiles/file/72776168765.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/71506032903.pdf
    • http://arcstema.com/userfiles/files/83436533573.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cincinnati+reds+wallpaper+for+android
    • 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_off0000bdca.bin
a41183da04a97e8639c36b572c720cd9f9442cb1036aa007b283255d02cb3e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCA 10728 bytes
font_01_sfnt_off0000d6a3.bin
46f655f56b921b4810c80e5d9e50c693a42b2172e7ab0e7a07e48454b26b0264		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 17356 bytes
font_02_sfnt_off000102a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 16792 bytes

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