Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72d76eb47e0f891…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 21:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 021d8bbdd503a8066dcaee6ad96485ef SHA-1: f10cbdd31dba8906a36b8acbfadaba1c98015076 SHA-256: f72d76eb47e0f8918dfa67798d8027a5b58d0e372f64ade4dcd2088c262c05cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, directing users to numerous distinct hosts, many of which are unknown or suspicious. The embedded JavaScript likely facilitates the redirection to these external sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a519da4b9e---pisefukatija.pdf In PDF document text
    • http://snieznik.pl/userfiles/file/28032334891.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/84352141658.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jediwozemerufew.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/lazeril.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903183000482531.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/4700825912.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xenovipolebijorixunumomi.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac30394fd0fd3174efcbc934af4861a/kexoxo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/59836697192.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/pefoliraxupifetinirufebok.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/fewafadalebetokotureboz.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/424911_jezukegolabizazibuxe.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/66332829520.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090723484480554.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/xikoviz.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zakijirajovu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/97046342278.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/91824758386.pdfIn PDF document text
    • https://angkalaris.com/contents/files/13407470370.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wosuwizonegugali.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/17903180829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+free+ad+blocker+androidPDF 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_off0000c407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC407 18396 bytes
SHA-256: ae34a6bc6b924a6d592a6cceba6b52678dcde22aa5b1f439423e7b93d29f9f53
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10752 bytes
SHA-256: 1470196c50ac1a8f58bffd1a2bcfeefe83ab9533fdf780e8c3226b2afb692681
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1