Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aba147b5934a66…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 09:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a02e1aab757fa6ce2e923e3fd39e4f1f SHA-1: 6e2a86e8a61dd9ebf056dde653a883b27318e9a9 SHA-256: e5aba147b5934a667cfa67bb44c1b9cc74151a6a000199100cdb9fba21395c0c
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious software by posing as a necessary browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://woodbridgeabw.com/uploads/files/25705247801.pdf In PDF document text
    • https://airin.lv/images/userfiles/file/59363346359.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/16534621275.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/29777969676.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/woliwofutit.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/57394670896.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/12070568725.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bejamusutopofogop.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/lokepunexaz.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/dobireko.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/denubomof.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/86445687363.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea33892c6d---zisoja.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/75302882307.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/dexukuke.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/1087580797.pdfIn PDF document text
    • https://kimcert.com/E/file/farak.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/fabarokegudisufuxogivuw.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/takagi.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/defawavavesuwukuwusawuwo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vopirixunutekopiwumiwij.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/romufekobexilisazekapa.pdfIn PDF document text
    • http://charivne.info/images/file/77391336255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+cricket+service+hackPDF 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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10192 bytes
SHA-256: 49302d0991e2f6ab3b430bb65c0f623a8b28ebebbb350f938e71d29fedc8c726
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 17476 bytes
SHA-256: 08838e4ea4fb42515439bbb4fe492ef232d1e0b73fe387aeb5733b062b769d79