Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6bed95d9eed610…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 01:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab143e3f86f6fc88bb6f06680384709e SHA-1: 3609a503209efc2e89d4e520fb45dfa56f6b4a98 SHA-256: 4e6bed95d9eed610a389b916f62076b9c3da0ddfd82df2b99be0c95e6efb7e28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this file being part of a phishing or malware distribution scheme by directing users to a large number of potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e47983c0---fewefitapujotemeledipo.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/79429470523.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/bonagepovirixegulefegosek.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/kegitabadaxizavamenaw.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/2196028851.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/37130248143.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/nejudane.pdfIn PDF document text
    • https://pecsikult.hu/files/file/54495395751.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rebarunujaporilosa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b0c99f1---maxot.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/90005408379.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/bezesabuvo.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/solavasexekedujunek.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/30502610138.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pafafujupenimivadej.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/11770410388.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/51706286594.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxafijinugufigude.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/73562887174.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fipopebojodamusesegabed.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/vavedaxadinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=set+custom+alarm+androidPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 10708 bytes
SHA-256: 419fb879fdd162810609bfd483a606450405dbe120e984c1fbb65773d014425b
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 17728 bytes
SHA-256: 1eceb59dfcb1cb2c3a04c596f428142d25682fdd1d0aedf2b3223a3797cc6c2d

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