Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25b48fa0758a4c2…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 08:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a69728ddddc8863382252eabcfe52ba SHA-1: e64b08dfd95346e0d9131163942ef886671a5932 SHA-256: f25b48fa0758a4c2b899109592986914aee88c87a3a5c5b561c181bd62084a34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on potentially disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://deshpanday.com/ckfinder/userfiles/files/67827106053.pdf In PDF document text
    • http://m3hotels.com/userfiles/file/25615273638.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/vasiveputiwixexewibakusi.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/81200739715.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/36123812416.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/79487532902.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/duxaxunonipuseze.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/melov.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/pidifekiwumiri.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/retak.pdfIn PDF document text
    • http://freestyler.cz/img/file/lodewawe.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/mofugomidobelegijanito.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/50835098295.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/raxevazexolimeno.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/6799883943.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/30461241968.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427e6ed1951---30330541125.pdfIn PDF document text
    • http://salwex.hu/file/56333991937.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-04-44-15-10.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361171bd70e---81049722489.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/66832448504.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/27987701328.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/5412887860.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/77374894578.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/90423785214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+amadeus+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_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 19148 bytes
SHA-256: 3c54b5d1c8fdd48ca86c7c934c907a53563bd502c1d5833ea8033bf64d1b3e2a
font_01_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 10292 bytes
SHA-256: 55984c9771e5a0268f3fac9336dbb0f34a4d0328b0156df6333c0661be67c3cc
font_02_sfnt_off00013b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1