Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f214f8a3147e9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 09:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1ffba5f25ba155fd08b2b5754d98e8e SHA-1: 9b12a07de725718f957fa677dc7427ea7a6cbcb0 SHA-256: eb7f214f8a3147e90daa3af86b8903afcba5c691bcddefe5e62eeb0cdf43741b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting it's part of a link farm designed to redirect users. The primary function appears to be directing users to potentially malicious external websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=is+iphone+more+user+friendly+than+android PDF link annotation
    • http://acecaalcoy.com/userfiles/file/jomunabajinogalileniweluf.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/1476396069.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/vuxilojim.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/63565930675.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/46697338152.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/76614401229.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/80019122214.pdfIn PDF document text
    • http://intersonik.eu/upload/files/dimixusajemorigomesobopi.pdfIn PDF document text
    • http://wmsone.com/eimages/file/17547587505.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/movetu.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/wavigevidugozomukopu.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/41108106340.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/55337354407.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/gevazunupozotatafugizot.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c761b0355---nofukupuzidiva.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/jojaxesonebuvu.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/84357677440.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/73531636839.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/39390876167.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/97798217367.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614504ae1043c---93267456032.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/15534756161.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tepatoparedita.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/59202089600.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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 10928 bytes
SHA-256: 9ea044f2b19e75591beb9768095a8fc1611d65fa6880b2bffb1187e5d611bf7e
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 17824 bytes
SHA-256: 44945c0b78e0837efb3bf8ce5ed26caaf74a09b809cdb068d8f00f1b2c7682a5