Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf98879a0247531…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 05:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b6b30e51643ad049ea8da5f334336cd SHA-1: b3e766b7575bce1db38a6721ac00d20f493c6455 SHA-256: edf98879a0247531d0fbce81e6d6842fa4a7a793a0c9cbeb8d676db47927773a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to download additional content or redirect the user. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0019882eb---pebiragafijekufivatetiriv.pdf In PDF document text
    • http://salman-group.com/userfiles/file/24299172008.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/52970438955.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/83755385292.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/rumudesomora.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/50755591534.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210907_031949.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/85289464375.pdfIn PDF document text
    • https://losungversorger.com/product/file/bikuzuremevixumumotaga.pdfIn PDF document text
    • https://educhina.mn/editor/files/mopobifalivag.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/6549155594.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/64449803322.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210917_205811.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/68630223912.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vovawomapijepuzito.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/63840128740.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/71530377526.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jonasorulesetonip.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/susixogomonotiputolakaja.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/zorileledufijelalodopinog.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kiwufudaxewukuxu.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/powulewibinafejojatog.pdfIn PDF document text
    • http://byecook.com/ckupload/files/4366429938.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/viforojejusuvobazag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=stickman+5+modPDF 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_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 16756 bytes
SHA-256: 9c47174f8b148fbb97dfc5a2d0e1c1942d6e95e217a14b6420727c4ba9668ce2
font_02_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10384 bytes
SHA-256: 97cebcf7951a28805cf65614c6e22766f9c5f0d49fe660145b56bc2c70baea99