Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0ca3ff1a146ab2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 05:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7bf0433792a19b3bf4c744f23737e3e SHA-1: 195d6243a4bfb77d783572c1cb5c48c5f453160b SHA-256: da0ca3ff1a146ab232a1492dc072ae94fe72e3f6fb50d26eef4b5582869dc344
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document's purpose is to redirect users to a collection of potentially malicious sites, likely for phishing or to serve further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://quimis.net/js/ckfinder/userfiles/files/geroxam.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/gutumu.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/kabepeb.pdf
    • http://pusancard.com/userData/board/file/61467602596.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/55734051940.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gebesexugejopezikosusi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ab3f9e838---wenetubebep.pdf
    • http://freestyler.cz/img/file/midetafutidularekadekugi.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/73fbf0317ce9c0596e2e5b41609a062d/41706494922.pdf
    • https://hoatuoi360.vn/uploads/files/seger.pdf
    • https://fentesmakina.com/paket/upload/files/70421128482.pdf
    • http://ciarajewellery.com/editor_upload/file/jokotoxoxexelufewuz.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/35256430051.pdf
    • http://studioagm.it/userfiles/files/22249016605.pdf
    • http://ekonopuntos.com/campannas/file/90852158253.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/vewemilu.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/vepumomopuruzos.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/bumozatujanu.pdf
    • https://champion-osk.pl/userfiles/file/xavaxorixagidit.pdf
    • https://igescanada.com/ckfinder/userfiles/files/raxufegonozagiv.pdf
    • http://studioindelicato.com/userfiles/files/66772088814.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/fepalefo.pdf
    • http://www.americaninvest.net/upls/files/newugilopeperixeviruzu.pdf
    • https://interference.ajoda.eu/userfiles/files/ziriwovemusatawozum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=frp+android+7+apk
    • 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_off0000b088.bin
7b7c5fb78986c7b64180135fe9ebcb0bc30f4dc63f0222b0adda194c442643eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 10060 bytes
font_01_sfnt_off0000c6e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 16792 bytes
font_02_sfnt_off0000defa.bin
2adaf87232f99b5ce920911f5fc3fc3bdc15a07ea3d1aeba7989f1dba8ba8e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 17180 bytes

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