Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47c0c1d7203c750…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 18:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3d36c9534b482fa0228ce9c49cf28dd SHA-1: a75546b1d18e41292feb088dd609da0538717483 SHA-256: c47c0c1d7203c750a0ba1eb01f610b9d93d26cbd5520c935869168c20ef199bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/47497790019.pdf In PDF document text
    • https://pima-alarms.net/slicice/file/nufarifexitogifupi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a9ce289b---37174540645.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/vonixozeb.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/25952390486.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/66315601612.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/53191784450.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/23695428719.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/53178540975.pdfIn PDF document text
    • http://samtekelektrik.com/files/lubukavozaverevev.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413d9233177---jumitoxevudikax.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16312781347858.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/7413226790.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nuwosabafedirubafuga.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/maresizexedetotuv.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/wakogad.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/73250021964.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nevafepuli.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/tomad.pdfIn PDF document text
    • http://gnox.vn/upload/files/gefevexejubatemivulew.pdfIn PDF document text
    • https://olterus.info/contents/files/xinugezuzubokus.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/lijagevakevoxitarufis.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/38807460871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=python+api+frameworkPDF 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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 17124 bytes
SHA-256: e0c81bd251d8752fd3b62a92820858a026e4409be48f51b8810cb16eb8fd2696
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 10700 bytes
SHA-256: d2e45c9de20a3113c10a86dc6de40ca80a324bb991554a2516e0e2f9b3c0ee9d
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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