Malicious PDF — malware analysis report

Static analysis result for SHA-256 31698b344ae9b311…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 21:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1adf83417b63a89022f45cbcce09916 SHA-1: 4e69953c29bd340c045a79f05f4c009db2d81d54 SHA-256: 31698b344ae9b311f23ea21de3a2c64913f7f7b1727e468d8d637495bc220a95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external links and the nature of the detection suggest it is used to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sbmhavacilik.com/userfiles/file/5083249044.pdf In PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32998274724.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/95064056540.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/bakegef.pdfIn PDF document text
    • https://masukpt1.com/contents/files/doritijikonokaposolefu.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/nawunedoxipisukar.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/wodagijitemasaza.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/68755235903.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/07044715393.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/42089458909.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/72983283913.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140183a0ad0d---rawomolamobu.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/efd03ae5739eaca28158545e5f5df004.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613841ecc6009---xolifit.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/komeg.pdfIn PDF document text
    • http://signauction.net/userfiles/file/66507844393.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/wubize.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/kupidolomupuw.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109032233099627.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/8360048329.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/63159440236.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/wuwukatosezomakexifejuros.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/11493604026.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/86334882131.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/3194503803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=castle+in+the+sky+laputa+full+moviePDF 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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 17260 bytes
SHA-256: f66554e98531c5750996496a9ed40abcfc4bd8e472a875ccf5e9f9c84174c41b
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 10924 bytes
SHA-256: e1238c897b4b81a1eb5f05b7c84fe998f5185a3089cea5bc6c198b5c8fb2e95d