Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d1f541c9cc6487…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 22:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb2eb335e10eff9ff00cb152f9ec112 SHA-1: 852e1e812043cc9fbb7aaebe03f396828dd4eb45 SHA-256: 26d1f541c9cc6487ae6b82a5be6a19d5932e1293b9874138bf240191c1d1f4d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=paired+sample+t+test+hypothesis
    • https://santchavarabed.in/ckfinder/userfiles/files/vuwiputaf.pdf
    • https://ekinyalitim.com/depo/sayfaresim/file/24403894298.pdf
    • https://ezsprinting.com/userfiles/file/mapasafekuser.pdf
    • http://schokofontaene.de/idata/88093156007.pdf
    • https://daulte.ch/ckfinder/userfiles/files/zizifa.pdf
    • http://veitali.com/upload/files/17041729958.pdf
    • http://mayinmaunhat.com/upload/files/13999729758.pdf
    • http://kprmk.pl/userfiles/file/90788345026.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4a98fbad88b26292300e859ad9102e12/tugefuwaziwawitinek.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/wonesinajalemuz.pdf
    • http://vyveva.eu/UserFiles/File/duwozasepolodiwiwejoxenun.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd1f97d7c---sunexoxutabedosi.pdf
    • https://xosobacninh.vn/webroot/img/files/ledikurewedod.pdf
    • http://bibikid.ru/upload/nejunumu.pdf
    • https://trimix.bg/UserFiles/File/47262456650.pdf
    • http://kingsfci.com/userfiles/file/21665617553.pdf
    • http://atanasijornet.net/uploads/ckfinder/files/xetivifiletozoxedukorimal.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/disovu.pdf
    • https://florissantdesign.nl/docs/Image/file/50824467050.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/jivebilobowobiguge.pdf
    • http://smsgurugram.com/miet/assets/files/nixekamevaxowewuxetok.pdf
    • https://srsatta.com/ckfinder/userfiles/files/jexaj.pdf
    • http://fuerst-architects.com/uploads/file/suwawax.pdf
    • http://kiuanai.com/userfiles/file/46233395524.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_off0000cace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 16792 bytes
font_01_sfnt_off0000e2e5.bin
34b1177ca5a471e1bb7f6c183efbb4ab1adeb6084c061766a6c04c844dce50b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 10668 bytes
font_02_sfnt_off0000fb56.bin
d45b17029b467b2ab928488dfd9092e8d02eb76f3ab0fed39c99ee7b1f5c2e6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 18004 bytes

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