Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3820e6e0e9f0649…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 20:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ca7e96f5cb9165f0b866af25be72d38 SHA-1: 1ce0514fa0f2400eb8b682936192a394ae69da26 SHA-256: e3820e6e0e9f0649e0d11bf2cd62cf144757b1658dee678c973aefd1e1879732
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://skykharchono.mn/editor/files/lazazemudoluz.pdf In PDF document text
    • https://nhomphuongnam.com/upload/files/nugifimifuraza.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/26407371463.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/60216636404.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/55580143605.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lewowijuwadibagaxilene.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/76829444653.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fidoxukagafuboninulopovez.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/94170078927.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/nukazenodoj.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/53700564370.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/xusipabu.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/91845040662.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/38333378633.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/tuvuv.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/24394596651.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/telos.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb76933ff---mizenarezu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/dejidosuboxalurulat.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/galixogurobosokamurisida.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/50532537819.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/35961005435.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/26044738736.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/33835798716.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/tulupezexategufa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391eb361b53---31611396057.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/14427250561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=app+icon+badge+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_off0000b48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 16160 bytes
SHA-256: c99c1b1a1f239d43ca4d4cd5322523a89f6c6f7a01d979d06b762b6f5fb0123e
font_01_sfnt_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 10500 bytes
SHA-256: 21357f7443c5310abb8faa0eb08dc7f666dfee21e0ff3fe2c54a27817d971023