Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b19c39d0af95878…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 18:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4177340f486a3050a37dd06390c1bc5b SHA-1: 60f0239c1811a9b610c3b1ff0be4e00ffc68e591 SHA-256: 5b19c39d0af95878d88f94ce91fb8b24deb3d15b46a02dc0d221a03a103115be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=download+house+party+for+android PDF link annotation
    • http://adhdesign.de/userContent/files/20210906135351-71155302501.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/50135478076.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/97286059742.pdfIn PDF document text
    • https://novsport.com/content/File/48369861548.pdfIn PDF document text
    • https://austarpharma.com/upload/files/sidanu.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gefipovokaxi.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/zunesazuxibesolokodowi.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/jerisigisovemowimufuwe.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/59799080066.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/30257722808.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/80440371422.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/monamojon.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/pamorokobif.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/53018946243.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6apjoq5v1jaceb6vumsu9b9e9/xewobaluwupipar.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/piguxelovidudexeki.pdfIn PDF document text
    • http://www.heksan.com.pl/file/dakojaxenamutalisoj.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/79055951706.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/36539985918.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210912201122.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/topapebaxilugofi.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/jiwoguxirosadi.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gozabineduxepetavejaxiku.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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 10896 bytes
SHA-256: 29f3ea26c10b6d778e8af82739f0cb22c802ece6168a52bd7b62baeaba6c6fad
font_02_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16852 bytes
SHA-256: a035cc436b8fe3ca04b7da525c52a2af0d0656779d8b328def39ef566bdb9f5a

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