Malicious PDF — malware analysis report

Static analysis result for SHA-256 452bf2928c35064a…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 09:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c09d90ee7e49efffcf00aac27c1c632 SHA-1: c96cb9db382da50f51014219816525898c93fa67 SHA-256: 452bf2928c35064a4fbc16d800fbb242ddf04656527275777da4a144e25e5146
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The presence of a link farm on disposable hosting and the 'Password-protected archive handoff' heuristic suggest the document is designed to trick users into downloading a password-protected payload. No scripts were extracted, but the PDF structure itself likely contains embedded links or JavaScript to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://tapuionoticias.com/ckfinder/files/57637472190.pdf In PDF document text
    • http://biurod9.pl/public/userfiles/file/kumumid.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/xivowiwumafudo.pdfIn PDF document text
    • https://samudra99.com/contents/files/dotagaw.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/71639941913.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/lefopago.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/pesabelebolofifel.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/28399856763.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/94450544343.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/rutizar.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/24855122227.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lunokilinopevokepurewufed.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/87068243078.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/negoboz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc6c625f89---tupisabisuvixipofivuwi.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95298438269.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/28677180853.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/muwajakalijedevexojofuva.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/fafuwibutawebil.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/toxitamoreleba.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/81056674901.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/kogigak.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wanagavevijujunagoxewino.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9831b6a1---lerovefalum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wifi+password+hack+toolPDF 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_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 19160 bytes
SHA-256: 09d61f73cf125b543da33a7a5a24f98326b84162503a06879f56256f004454a1
font_01_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 10652 bytes
SHA-256: 43cb399db8bdf1c2b7fc84d3f5d58ae70fb5d571ebf4f14ea7261576f85290d7
font_02_sfnt_off00014869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1