Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9fbb65935e1678…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 18:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 865178d92f6ce1e5a40a4ff5b046a4e7 SHA-1: e17a4956c006ccf102febc49aee4ae15cfc09bc4 SHA-256: 7e9fbb65935e167823146ed143f6890d66412f63196649be76d20ca6487187b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host numerous links, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://stehovani-ostrava.cz/static_pages_files/file/39097556767.pdf In PDF document text
    • http://wuyioutdoor.com/userfiles/file/54062980325.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/94885812522.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jifizaredogige.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/dizaduvezagobulatizijisa.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/wuloxasorevoz.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kebidiriv.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/dasamakakizajezuv.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/gojedakiruwegarod.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/12376848046.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/mabirejovijurovavozunadu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161367ea589531---varunetirobifepurizo.pdfIn PDF document text
    • https://kede.org/userfiles/file/64184492587.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/faxigojuberijudubelika.pdfIn PDF document text
    • http://atya.eu/files/file/nabimuzujuwifivejabog.pdfIn PDF document text
    • https://membermimpi.com/contents/files/12733865969.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/sokomo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fuxawov.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142577570031---koronogegonovanemiwiz.pdfIn PDF document text
    • https://norservis.com/files/files/pasabajeraba.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/betibiwurubobipaxamojifur.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210906/file/16309046779692.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/wogumodawufupuzigajuz.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca005f5bc15fdbcfa313cc0f6b8841cc/meduvodamujaxovijedefugox.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/nafumino.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/99091987721.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/tusemudef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+9+test+gamePDF 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_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 20408 bytes
SHA-256: 25555a93dd1391e35e5e04c56b8ba9b2306dc5f9e099144265bac5fb82f9a22e
font_01_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 10660 bytes
SHA-256: 21b519691e3957ec6bf360f9ed451504733d1b7271041645e8c3cf73157a11f3