Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ef078861bf71d1…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64cecf680efe103a9293ebba6a098c6d SHA-1: 527cdbb09b3665eef05590001200c841a27e63ef SHA-256: e1ef078861bf71d1d7e7ce86dc9f71fb9b425f1ab6f6db44b02462b06fe0c6c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links, likely to redirect users to malicious sites. The embedded JavaScript stream and external URIs strongly suggest an intent to redirect users to potentially harmful content or initiate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=free+junior+idol PDF link annotation
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/wetafilonajivetisokiz.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/64858523598.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/40888003700.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ba72eea11e42db8eadd7f8be4c53ecd7/13551646242.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210903060036.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/82532706650.pdfIn PDF document text
    • http://sbcnepal.com/images/file/11328526772.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/vukerewazunosiju.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141187fd2eb5---vimanobozademoj.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/86929403302.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/80596902725.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/66652874305.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/98872872276.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/kimevoguwiwosajepikato.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/27215799576.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/35053810529.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/tufijetiragodewaleveza.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/4518007165.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/1101407968.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pemewiketuvesiwafulapogig.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/3249325325.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/13306908676.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/51464216897.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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 18020 bytes
SHA-256: f16620038681af225092c98b3ed8dd61042091affc150ab5e9948f4848c26a4e
font_01_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 10020 bytes
SHA-256: e5f72b7032421f08cb23e9772754f9f7c902dd38a92035e329fec9527d0ecd63
font_02_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1