Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae18ef9f79796e95…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 13:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99b88b794a841faf263a0079b93034ef SHA-1: 084b787a338acbad77ca6c49190386af11c836c0 SHA-256: ae18ef9f79796e95a85edbcfc7e1c1420545a984b2f07904c01dff69f8da76ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, suggesting it is part of a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the document, likely to download further payloads or redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=android+device+changer+apk PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131820684c7b---firimolopivufupupijo.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/tosulogeva.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210907230401.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/jirud.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/42676203424.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/39435451789.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jimavevuruvu.pdfIn PDF document text
    • https://losungversorger.com/product/file/lixetur.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/46560335726.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/77445697775.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/80893809448.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/21365018641.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/32147639258.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/68330907091.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tupexanirenukimuk.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/fesizejajobewujokex.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/bisinup.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/betikizofiwopeso.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/82143356327.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/metasagusowu.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/rawigiredaloziseli.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/48162504066.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50592e985---75389496646.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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 10620 bytes
SHA-256: 0caebf14762e89f0776a4d597e0004473772e85b8f788be35596ecbe4eaa9c4e
font_01_sfnt_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 18328 bytes
SHA-256: 7fb3ab007bc2983083b0556127c55fcc7e788d2dec13568fc9ae7e9edef0baf0
font_02_sfnt_off00012819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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