Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba540f1e8b22999…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 04:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19951eeb97f2d4e796298b399b3a5b84 SHA-1: 50cead739dd0979ee3308b30922d3c798fd19ca1 SHA-256: 2ba540f1e8b22999e0a52abc047ea8a0f61f59e0db1c60c31225773a754bb566
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to unknown or suspicious domains. The PDF structure and the presence of embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://llibreriaha.com/img/events/file/rosemox.pdf
    • https://pottoka.info/files/galeria/files/76241019036.pdf
    • https://ilonew.tasksplan.com/userfiles/files/bedagonunorobewokixuwu.pdf
    • https://braindevelopmentmaps.org/userfiles/files/zumajab.pdf
    • https://brianspradlin.com/userfiles/file/35671065736.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/girijiwoxa.pdf
    • http://alkanboya.com/files/file///rawaliremo.pdf
    • http://derkwoo.com/upload/editor/files/74611307886.pdf
    • http://cycling-software.com/files/file/gegagi.pdf
    • http://100gastro.cz/soubory/files/kipawopotuzuzona.pdf
    • http://inimtrento.it/userfiles/files/74731844813.pdf
    • http://studioturina.com/userfiles/files/xemodomabapizafixejusa.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/babesediwezo.pdf
    • http://kajo-frings.de/userfiles/file/pazisijekixiberasupuwegu.pdf
    • http://salsainkonstanz.de/media/files/xiguwiluzeja.pdf
    • https://blueparadise.pl/userfiles/file/3487116903.pdf
    • https://pensionradvanice.cz/res/file/tifelejogizijizagetat.pdf
    • https://adikmanis.com/contents/files/buguta.pdf
    • http://daiichihousing.net/uploads/news_file/8322329416.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572f9de616---numurekogoridepulapet.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/fd35882b23b04dc573276107d55ac32c/gazokukulegejasudizebomut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sketch+to+android+studio
    • 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_off0000cc23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 16792 bytes
font_01_sfnt_off0000e435.bin
1ca4dbcf1cd7fba673d3f001ec5d772f9cc620659bcf42cec5ee2afcccf4954e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16376 bytes
font_02_sfnt_off00010e7f.bin
e34a0b91ad66e2a4b2e194fd496e002e5e7ae2ee65c621cbe9e2f0cd3db1f622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 10688 bytes

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