Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48b08308daa9e03…

MALICIOUS

PDF

93.4 KB Created: 2021-10-05 02:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3904a57f1060e777eb728a3a6656220 SHA-1: 8de78a24c56d3c4b5d2acc4f1cffaf8b04edda2c SHA-256: d48b08308daa9e0372621b9929a254ff5b79c78876b397fbc231460c496b651f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://huntic.ru/uplcv?utm_term=shakespeare+plays+in+bengali+pdf PDF link annotation
    • https://amgaa.org/temp/files/55014649865.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/nufonotin.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/35052126180.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/72756357557.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/zogajewikugovakux.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/18447780270.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/95196059804.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/51270664554.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456070a4d10---giwetugibavibawijoluxejin.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/1314606107.pdfIn PDF document text
    • https://successalpha.team/upload/files/lamikotufinapokewuz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a80c3c311059ee5016520f9ccc4f9f7b/13471945555.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/60142896651.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/65257798187.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/88872612204.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/todopumewoxexizizubu.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/902799818613d73447b58a.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/55949317670.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/berojasisikupofanopifo.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210925_222151.pdfIn PDF document text
    • https://haidangpc.com/contents/files/kirulivixogus.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/doditemomogaboxil.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/favunijoketavole.pdfIn PDF document text
    • http://stl-hk.net/userfiles/guxovifedopakoretikexa.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/57565099822.pdfIn PDF document text
    • http://uhorder.com/upload/files/59770666338.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_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 10980 bytes
SHA-256: 528f1ae6f9a8c4c0d0e5dd3abd8071705bdbec82661a9bfe6743dab04546179d
font_01_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13439 19792 bytes
SHA-256: df404e1ea0022b4ffcc74d81cda0f34fa8d3c3e5d0c692ff0af52fbe1d7b2612