Malicious PDF — malware analysis report

Static analysis result for SHA-256 e537609cd68ad8e0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 00:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7403b03b884671480122f36f9b01355a SHA-1: 3e88ce1980913d109b72ad8fe62374c19514ba05 SHA-256: e537609cd68ad8e0a9333813b832cce23c9b7ca3a04a1900462d9d5097d748de
126 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 numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+hide+online+on+telegram+on+android PDF link annotation
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/danagez.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/gepukit.pdfIn PDF document text
    • https://iwistw.com/upload/files/12851518759.pdfIn PDF document text
    • http://thuannam.com/image/files/96683414619.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gegufoloda.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/guwodeguv.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/pobapetowamo.pdfIn PDF document text
    • http://strandedtattoo.net/file/60768606894.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/pawabutibituvufi.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/segunugorukivanabigipeb.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/3206124256134fc675eec2.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/xuzakegimux.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/72010626250.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/rexeme.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/97520714774.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/29918572898.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161328a5ced183---fizenevip.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nipoj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gikuxugisubi.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_E34FB26678AAFA5D.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346d2359e06---dapasevir.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/54492706518.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/zirugaxabopojiwuzix.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c50bbee58---56278917351.pdfIn PDF document text
    • 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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 18756 bytes
SHA-256: 96406d2747d5a2370ca2c7242994525d3cc1e3e1aede3692ccede7e1523edfff
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10604 bytes
SHA-256: e51fd9a142e6eca89d0148de292f22e528580a1895e78539684bda1ab5c28754
font_02_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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