Malicious PDF — malware analysis report

Static analysis result for SHA-256 4554d1bae2719022…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 17:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baed3ba47a73adf640d86e6134d45fec SHA-1: d0cfcac7244ddf0043b9126ff5841a441ffda4a0 SHA-256: 4554d1bae27190220a086e6fb483c625aff88ecb9339f0ae0d048931b4a2d348
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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
  • 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://penetrat.ru/files/files/bezexakawokaganak.pdf In PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/97927369608.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/sipusewovewixelupe.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/gurezagoruw.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/532845777.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kozovogoretawuver.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/72007498048.pdfIn PDF document text
    • http://laserinnsbruck.com/static/zaxakaxarukewubiki.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/gaxipamolode.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/rurug.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6fd41ff2---97354152219.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/fepesuvinitikulup.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1693645911.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/refowir.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/35826075338.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/14532932483.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/69095981812.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/bukedike.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/24209240147.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bixavowovekixopobedada.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rerejijasalor.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/redelavukewutawaj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fc8bbc89e4---xazirizodewasopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=five+letter+words+that+begin+with+iPDF 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 17556 bytes
SHA-256: 89a70264ea164b224400c9342e52951bc36b60d5ba972013246c01565941efc7
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10796 bytes
SHA-256: e4c5c68cd7d02e3f95418844e489141fa550196f2f247f44b5579dc5c3a8074f
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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