Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc09eea6d77c543…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 08:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd83cc7358572b3b3ed87ff99411cb88 SHA-1: 9fa26a7f299ed79cb94efcc56f0658f2c9656c43 SHA-256: abc09eea6d77c543727fe23df0d9db0019fdb1bf9874e4807b73516100c958a5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laarakkers.com/ckfinder/userfiles/files/lizuneg.pdf In PDF document text
    • https://genia-groupe.fr/images/files/92711430061.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pojavizukumezalo.pdfIn PDF document text
    • http://fullx.net/files/modomisubixelojemebivur.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/mivanomasefegepa.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/9637559971.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/32955414327.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/suvadumaxapamewuwujuvu.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/sometimejitidevagipofojaj.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/birarufeluligifozelaxi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d06f351e---15748024870.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/53524121225.pdfIn PDF document text
    • https://red-adlay.com/upload/files/72202122245.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/kazipimenexu.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nabejizozijafobe.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/41626846586.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630869820_1.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/47722210929.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/konawemipeki.pdfIn PDF document text
    • https://cape-electronics.com/media/file/nozivekaw.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/rejuvariwokokutojep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=joseph+parker+vs+junior+fa+livePDF 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 10736 bytes
SHA-256: 2fe46bd5a0ac8e4f8467fa087a604b30289816822cddf6ccb834647500ccb992
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 18928 bytes
SHA-256: 141866ff34a5c422b1159bf321122ea703b9482b8beda730cca1e858f34eae28

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