Malicious PDF — malware analysis report

Static analysis result for SHA-256 a900a0834d21ca5e…

MALICIOUS

PDF

85.3 KB Created: 2021-10-29 05:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8acca24bdab954a9a5fe4c32affe2ed SHA-1: 86169e22118ae31b7548019e037a689e4affda8c SHA-256: a900a0834d21ca5e3810e7a323a611d2d71e755514f60491fb753e14af9987a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://artetendasud.it/userfiles/files/35461045462.pdf In PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/bidigijiriwedugoborebi.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/46750490849.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/kipekozifakewerumud.pdfIn PDF document text
    • http://annabarons.lv/files/files/11085896897.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/4273040567.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/7912116894.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/16628676542.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/zutitadosupisuxidimolaguz.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/35900623369.pdfIn PDF document text
    • http://esistore.de/userfiles/file/57405164311.pdfIn PDF document text
    • http://prompol.com/media/file/933725954.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/xovopesoxisidiwam.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/muroxugowowez.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/69881293846.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/38636632087.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/4189813096175d0a72ec27.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/32528645997.pdfIn PDF document text
    • https://wineart.online/userfiles/file/64820576173.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fifewolade.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210922_2F4916F127F26017.pdfIn PDF document text
    • http://keacg.com/upload/files/53631499023.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/28632969951.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=whale+shark+is+a+mammal+or+fishPDF 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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 16900 bytes
SHA-256: 79cf595002507bc88d248118e0c8ff7fab046c2ba4f8795a88f4d398cfb87615
font_01_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 10364 bytes
SHA-256: f6e7c6238235aa10431dbb49fbad6949e0211c8a6c41eeea726cdb58d9fffe7f
font_02_sfnt_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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