Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6941150c017eb93…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 18:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b1d2ac4b929f5f53e6c5940ab1dd286 SHA-1: 8ffab8b3a86ff51bb1710b9e28d06ffb32798cf6 SHA-256: d6941150c017eb93bead0ee87bf7376719fe168b4d2f538ae7e025284143dd64
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 that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=tubemate+app+download+for+ios
    • http://etspak.com/survey/userfiles/files/85030988049.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/2819254660.pdf
    • http://artpolinakuzina.ru/pict/file/15596754978.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kesoboroluxadurutogu.pdf
    • https://sesconbs.org.br/ckfinder/userfiles/files/48579732742.pdf
    • http://5percent-design-action.com/upload/users/files/zaxajekijazopotokimunekos.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/debotonorofisosoberemes.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/89034880323.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/dixugijawodolinobok.pdf
    • https://berettyobne.hu/userfiles/file/jidixima.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mifek.pdf
    • http://paradisoseminatrici.it/userfiles/files/30448177379.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613704c055791---30274746283.pdf
    • http://joyear.com/ckfinder/userfiles/files/34967281120.pdf
    • https://budgetparking.ca/admin/uploads/file/budunasilodulipuvukupeze.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/zumewuw.pdf
    • http://ddservice-bmw.pl/userfiles/file/tanavujapififimejopega.pdf
    • https://mauspro.net/upload/files/62984666536.pdf
    • https://aqua2go.pl/galeria/file/zufekanod.pdf
    • http://anindecor.pl/files/file/zukuse.pdf
    • http://apex-architect.ru/images/file/xubazuwutudesidor.pdf
    • https://vanrun-it.nl/userfiles/files/56966490740.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/22282432423.pdf
    • http://st-communications.com/ckfinder/userfiles/files/kavafirezakomakuturujow.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/94595742366.pdf
    • https://xanbiente.de/userfiles/file/febetanerupe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b52f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 16792 bytes
font_01_sfnt_off0000cd46.bin
088c273ecfdb189a6694e8e131a1e7238520bf7c8c6e7209ea7428f35ebcc9da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 10948 bytes
font_02_sfnt_off0000e670.bin
1ceff8f8e93b0667dd9d3757115268eb3afcfb20aabb0590766fbbece5f06909		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 17808 bytes

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