Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef19706c85e57b46…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 21:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb7812ed5c21ee0515670fd9a2276e87 SHA-1: d7672a8d7481824ebe8849376f7a43649db0fba6 SHA-256: ef19706c85e57b46d9d7132b20112e76ba20f6af017fd09b718f96b0edb58ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or content distribution network. The presence of external URIs and the structure of the PDF point towards an attempt to manipulate search engine results or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://hobbes-group.com/upload/files/wuzaraxopiwetodorimeb.pdf In PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/59927977310.pdfIn PDF document text
    • http://mobitransjogja.com/files/62505408700.pdfIn PDF document text
    • https://jobtiara.com/files/files/parodiledupafapigekifesa.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/befid.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77681279525.pdfIn PDF document text
    • https://ayurmitra.com/files/file/fakezugefirevaxifezomo.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kuwifal.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/koborexuwuz.pdfIn PDF document text
    • http://na3.it/misc/file/zoturikuzovobowomez.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazobazaju.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/zejofajeregifeva.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/43487045816.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/49229606730.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pofamodobomubevuletuvizoz.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/pimivif.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/78739128848.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nazizadoberotozovaxaf.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/55851620306.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/sorurefibafisotab.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed86f78a---samen.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/32146516528.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/zudatovaloxedetetew.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3cgnkb9ec1f24heo3s4mip1knv/bogeno.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/darufodazoxumewitiwo.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/68858012135.pdfIn PDF document text
    • http://goldmustang.com/files/files/jisegef.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fanukuboxuvegarodirezafan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=homescapes+mod+apk+unlimited+stars+download+iosPDF 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_off0000bb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3B 10944 bytes
SHA-256: ca4ff16f34ac2ea6593fa164b6b623387e1be78c4b06a302e91b9ab22f8ca796
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 14960 bytes
SHA-256: 05c22d217d26cb207f33bf6e357c9036e882dd5acef6ec8da197179bd1e4fede
font_02_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1