Malicious PDF — malware analysis report

Static analysis result for SHA-256 9596a99c520aa009…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 08:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b84ac29c34e6234a597d0ef531bb3611 SHA-1: 35bce6ea21136e8c472be370d75d6ae9ec3992d8 SHA-256: 9596a99c520aa0090e1f3768169937e7b818a5a649e364463dcebcd5a5f9561c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=x96+firmware+download PDF link annotation
    • http://trevelsi.ru/ckfinder/userfiles/files/nezuxolukagirimaj.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109030843489859.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614349edc18cb---kaxobedafofilolafaloluzo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/makajasofamasupepo.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/19525223414.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/42383099396.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/rowixesadupunakij.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/sotasurefefigosevikesaju.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/komeletowe.pdfIn PDF document text
    • http://christopherdallo.com/file/85045487238.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/tixutaruvabi.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/98726366972.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b830ebeac29b3508db92840c8b48274/90386556045.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/15475500568.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/tijiwu.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/54382210339.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/litavo.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/gekinipubijinikulov.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/muxiniwadizojotukoj.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/nudupemilagekejajuzopami.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109130450465131.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/kiduwutaf.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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 18892 bytes
SHA-256: e5a5934e2c653839a00a6a6d0c910ec70369bf94e39dfec5ce932985dde896ad
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10680 bytes
SHA-256: 96656a029fc447690c913b8ae1332a6b8d3af8b82737c7d9318230c76aa14eb5
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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