Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd283dd72efeec5d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 22:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4612317141cba451d8cab0ee510a04a5 SHA-1: 7dcdde93f14e11405b339031d6067a437980d309 SHA-256: cd283dd72efeec5d0defe3a532a215ed76f19674f306476f6bfeac7b3e81a1c3
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm with numerous embedded URLs, many pointing to potentially disposable domains, suggesting an attempt to lure users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eveorm8o2cs1dmpv921csrbi3s/kumufajasiwoxu.pdf In PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/8834076456.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/15034500148.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fidolarinev.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/tijatubivise.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/fukabebebejunekomikom.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/bofulorujaverumuguj.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/dutelixiga.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/91401578219.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/gewetipufarolusafiwadag.pdfIn PDF document text
    • http://word.mn/uploads/assets/94508959399.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/jifojuliwirimasikoremud.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/93522463227.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/51627695714.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/43268381525.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ab670af617af32538fecdbd55b764220/kaxofajevixugusolude.pdfIn PDF document text
    • https://eslms.com/userfiles/file/91609887698.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/7429211413.pdfIn PDF document text
    • https://kaisar168.com/contents/files/fatefiv.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/fubinebesadukivudoga.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mikamemexatajiwejebon.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210903183426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+cached+data+on+my+phone+and+can+i+delete+itPDF link annotation
    • 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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 17836 bytes
SHA-256: c495540533fe6e015fd9bee4fcb9a50ead0c57e9db40c4b5d2f5236edca67f04
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 10784 bytes
SHA-256: 4074c4414d1e27917a4ab456130a3758cc2920ac62241332e1e9ea50d09325b0
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.