Malicious PDF — malware analysis report

Static analysis result for SHA-256 056edd9c2105e25a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 18:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bdfebd0bdcfdf4f3c6d775d5992cc8e SHA-1: 31c794e8ce24b25fed6efe2411d05bafe986c67c SHA-256: 056edd9c2105e25ad3c0ab67f4e7e2e2b8c0a0fdce0e1c44b7c692706de2f0a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=moto+e4+plus+firmware+update PDF link annotation
    • https://rheinfurth.de/userfiles/file/sajijurowabijat.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/xoniduwunasez.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109161514334708.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161374d351c9ca---rasijefomate.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/42999388321.pdfIn PDF document text
    • http://zmz72.ru/files/file/fitujimipopisuge.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/77009318742.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109040598_239729987.pdfIn PDF document text
    • http://szpk.hu/_user/file/60341740739.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/28859252188.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/xamatapepu.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/52699549157.pdfIn PDF document text
    • https://tavio.ru/files/file/91487923529.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/18523136652.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/pipagapiwozokenusosakarav.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/kewatewisojowakosonosi.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/fusaterivusurew.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/2087062136.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vijamitoxadukogekelukig.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/17129203091.pdfIn PDF document text
    • http://grimastone.ru/files/xulexuvonusadivim.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ea23a39d94b5b7c567ad2b7099f57ada/labes.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/zikilezusekalurox.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/wuvufolavom.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAC 15052 bytes
SHA-256: c3ca6762efa963f90e538f87abf16a52775e9f0286c9e0a5b4192002f16a069c
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 16972 bytes
SHA-256: 277a3574a743195aeb641301385910c7a4670d94a1b1a2fb44bccde82d6d058d
font_02_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10812 bytes
SHA-256: 05f9575bbeef1a669ea766cfa233b737a1e6c72c2196d328a103e3679f03ce66

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