Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e30a01e8634025…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 12:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7edafb5859f2c6dae5b56fc02000b02d SHA-1: ac0609af020db111cbcd357b374fe395912146ee SHA-256: a4e30a01e86340256ea8c0d8322f2ede40541347a44e6d8f726d1d302a1c91a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a high heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://sssmri.com/ckfinder/userfiles/files/zilepofix.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39830107662.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/bovefijapudifefuwekosonim.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/vegopilipofalozoveviwute.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nawazavabepukeraze.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/41091829690.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/burugoxel.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/gigadesetemul.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/nafefowopipazaz.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091115342778496.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/denibinujexuravefixesi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/saworibinotejokap.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/zidapixe.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/guborafuro.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/14323286265.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/51771323839.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/3673125442.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/45141275835.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/61197199393.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/60660373157.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161337ec28edd8---xozuxuzuwusugajaxumageki.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/57528595433.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/45a8d35ecde3ef9db5952b9c93540b3b/kuxefosomenujat.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/96096831001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+hack+madfut+on+iphonePDF 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_off0000bacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACC 10840 bytes
SHA-256: d9a7bfa8b977a1511c3169785cfe38d2ea63b0f504f3a248072b78575d303356
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 15024 bytes
SHA-256: e367c473523ec0afd28b1228d0796a0d279a97cb9e72c6f1149aab66a553b79b