Malicious PDF — malware analysis report

Static analysis result for SHA-256 6410f77887bb88dc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 08:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10718095e8295c4ed2c5ac5696c15da8 SHA-1: 1f52bc116c034982a4f3d3dbd12bd8fd8e3ace48 SHA-256: 6410f77887bb88dc2dbed2f6ef8d88b31569926ef5cc64275fdc633b77b0c059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://castel.lu/userfiles/files/jibimolagalilokesesur.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8907ca40---rupavadaxe.pdfIn PDF document text
    • https://12shio1.com/contents/files/76333071589.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/6720584885.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/16669938559.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bufudifuvovedekogoxux.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/mefixem.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/41448378383.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/87588584136.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/dosiwofokoxekenilatid.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9671932104.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/pedezosumulole.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109071214164128.pdfIn PDF document text
    • https://cargotavio.ru/files/file/gipagedeseg.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/repudofitosidefixogomive.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902195250.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/wuwozamanib.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/13640940753.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/dizajosuzegabugonewujof.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/fadafoxusu.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/samivokalisusotili.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/48363888788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dosti+ke+upar+shayariPDF 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_off0000b225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 10504 bytes
SHA-256: 29a1ca42697dec009066a3e263e2d49df85a2e570ed8d3c690e0ebfc31bf7751
font_02_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 16600 bytes
SHA-256: 4ac9a7abfd8f0b5c107ec672aecd6fefbe9b90a448905fb6ca4eca7b1ca63ae9

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