Malicious PDF — malware analysis report

Static analysis result for SHA-256 b262bf87366f2552…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 05:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc0d9706ede5aa278012777e6754ca1f SHA-1: d3bfef2eb1f0d7840c56922895b75d722e3fe77f SHA-256: b262bf87366f25524f5b03443255629ff8c8f1990b255defdf47fc972f6563c7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to obscure the true destination or host multiple lures. The presence of embedded JavaScript, combined with the link farm heuristic, indicates the document likely attempts to redirect the user to a malicious site or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kapfenberger-schuetzenverein.at/userfiles/file/benitenaviriviji.pdf In PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210920_1BE7E22EBE482CEC.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a4eceff65---dogikojonijesebedalaz.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/luroposudurebetobusew.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/wenajiviradexepaneporuju.pdfIn PDF document text
    • http://epicridesnepal.com/files/bolulagofipabujukimuxofi.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/17030466697.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/41555463871.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/83515040185.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/jirozuxejufazitejo.pdfIn PDF document text
    • http://riph.pl/userfiles/file/77706835032.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/gafodetoravuwedusapa.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/jigavagaxudixedabubakubom.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/mujijagunakelifipeg.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/naxuzetap.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gerugo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/a8b890cb9fcb031307fde9427bc71967/35437313094.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/bupunemepuruworijosonu.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/ralebuzulipofajinig.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/xedowosilaro.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/zazasinaxidazevowazo.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/nepinadogububafuzivovi.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/37344550690.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/vabugofipipugozidipuw.pdfIn PDF document text
    • https://eguiders.com/uploads/85791566743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gta+v+free+download+mod+apkPDF 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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 10680 bytes
SHA-256: 16e6ac7c5c7183a1400e229e29afecebdeab2f793e45954257fdcf1466b60707
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 18576 bytes
SHA-256: 085c038f1e8d039daca00ccff749c648830f0750e53e78822ec446d9ced53c5d

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