Malicious PDF — malware analysis report

Static analysis result for SHA-256 2052f4170b314780…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 18:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9f5fe89b598bb58c1a2bed282c8cab8 SHA-1: b097f5f84ed1eae6f1d97007e7550d6932679782 SHA-256: 2052f4170b3147801323e4e696b89cc0a4899ac89248c7b2d5008bb8d1de6d88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://shiprapublication.com/uniformkontakt/userfiles/image/files/gazoluwagojamuwafimowib.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/80165093558.pdf
    • http://location-appartement-venise.com/italie_documents/files/45317109089.pdf
    • http://sensitiva.fi/UserFiles/File/76098324346.pdf
    • http://www.jindatunnel.com/up_files/file/dojifejugakowojew.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_45ABCA2388AAB476.pdf
    • http://nuovojob.com/userfiles/files/subarikevebenev.pdf
    • http://altelaw.com/uploads/image/file/teragu.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/fewiw.pdf
    • http://insfilings.com/skyzone_classic/upload/files/44988525678.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/85308588307.pdf
    • http://sibstroiexp.ru/userfiles/file/gavedojoxuxarugi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139283e12caa.pdf
    • http://brain-sh.tw/upload/file/zixujuf.pdf
    • http://eurolocal.info/sites/default/files/images/file/83642584194.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/96660148148.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3817819a7579992823360791aa3576d5/78300854202.pdf
    • http://pnalog.ru/images/file/vapelupekuf.pdf
    • https://satbietthu.com/luutru/files/xofajenekozilisapebo.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/69061775075.pdf
    • https://espritgt.com/userfiles/file/repemo.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/neretikobazogugowat.pdf
    • http://trumoi-khutrung.com/upload/files/lowipekorixakebase.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+android+games+2013
    • 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_off0000ef10.bin
83292246bcc81cacffb64c95578b121b9a95bce510b3102303d23e3bb3f78567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 11064 bytes
font_01_sfnt_off000108c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 16792 bytes
font_02_sfnt_off000120d5.bin
63806741ba99b5da6a6c3e3b0cfcc48803ce0775b95ed7e3f11c1173df0ca789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 17060 bytes

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