Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94d88286a4a3f68…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 11:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e98ed2590270fba6f568d209a78f750d SHA-1: 479175aa11875a48481f1e3b2e6eb3ea5d5b2b07 SHA-256: a94d88286a4a3f68ba8067332470157292889b21a120d1557201b723503a1711
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=how+to+remove+miscellaneous+files PDF link annotation
    • http://agro-pasz.pl/ckfinder/userfiles/files/25217914012.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/90089860183.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/55576124597.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/53939090312.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130412d40bcd---xetijoxupo.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/najepifomidosegopekubugij.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kazuzeka.pdfIn PDF document text
    • http://ud2-140.com/files/lizikavewigap.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/towedegurivik.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2eec844c2---dupolobafezuro.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/54567701588.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/88679131586.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210903131940.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/18144337623.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vudamapemuwezadozunogi.pdfIn PDF document text
    • http://allier-genealogie.org/File:/rozub.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/26701724577.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/26335781802.pdfIn PDF document text
    • https://norservis.info/files/files/32233930899.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/77742311380.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/dosepebijurigoxusif.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/ginipanatexapopowevi.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/wakofapurudozumaverof.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613170d8c2fa5---60546866324.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 18116 bytes
SHA-256: d7127ce72d8cb89b4cfdbc7c0dde16255bbe812a84dfbe4a8811b77a032d0d59
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10740 bytes
SHA-256: 63373dc1171f1551a8ffa90833c096807f9d2f3c7c99988e70c3673cb16e7a81

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