Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50b1156c12fa540…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 18:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80465851e5557b601b874deefcf5cfee SHA-1: 8afb263af82c1a110339e544a02683d7305cbfd4 SHA-256: f50b1156c12fa5406662e91760722090f21b5f640c241e2275bd37f965c8574d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream, which is often used to initiate malicious actions like redirecting the user to phishing sites or downloading additional malware. The presence of numerous external URIs, including one identified as a link farm, further supports the phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://etspak.com/survey/userfiles/files/57316816185.pdf In PDF document text
    • https://rougezenekar.hu/files/file/betusuwikenimowerel.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/kefisifobifikatun.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/92904436779.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6c332bb81b8d133e3f8612274a4a644/88298182818.pdfIn PDF document text
    • http://ruresept.ru/files/file/68130609012.pdfIn PDF document text
    • http://popeyebio.com/upload/files/50612030875.pdfIn PDF document text
    • http://akafgdsgreawy.pretty-match.com/upload/files/16886331027.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/wosuvesifugugosutezomuti.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/1263378653.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/16925588855.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/kikitukabinisefukonitor.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/62389769150.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/puwazuk.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///mepivubi.pdfIn PDF document text
    • http://partnercable.com/files/bojadalexonumefegaxiguw.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/48564675458.pdfIn PDF document text
    • http://decorstore.eu/upload/file/sixeme.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d240711d---21988626378.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/dipakipa.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/84650884372.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/mejubim.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/gujosafogux.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210926221726564035j6xhib.pdfIn PDF document text
    • http://www.520amis.com/upload/files/wusijenovumofu.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/63622806934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cast+to+computer+from+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_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 17776 bytes
SHA-256: e448a286142bbc6e402b9f5607b9a95d1951e1bb2dba5726b4329f37c9482f52
font_01_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 10864 bytes
SHA-256: 8e528e3bffc6192fd314b42d9001cdcbbe8c7ef662eea247a20822faa34d0197