Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b36cd30a261801…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 20:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d62d23fbd2b24ac0d8a6a9706dae8e82 SHA-1: 373d9a929f1eec5b51c8acbf6f1d17d0f5fc6a41 SHA-256: d4b36cd30a2618019481b1dd11777ca1349424e2a9d50f49209807843dc8b22a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs, many pointing to suspicious domains, further support a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bawetazo.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613098b7e4344---netokuwazejaxop.pdfIn PDF document text
    • https://vzglavniki.net/data/file/21820939767.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/fexenovidobunowomokeba.pdfIn PDF document text
    • https://angkalaris.com/contents/files/43538502822.pdfIn PDF document text
    • https://zzhqhi.com/d/files/sivejotutadutogirowuxavaf.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71027292863.pdfIn PDF document text
    • http://sentai.cc/data/file/20210912_041909_198.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/63139580468.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/votegeporobureze.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/27095167488.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/penegepoberupexeti.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lunuxama.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090907505140.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/70029692803.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/37722436966.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/jiniga.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/54401528050.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/jifuzipade.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/68978957980.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mafebewikuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mi+a3+latest+software+updatePDF 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_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 10736 bytes
SHA-256: 88d1b7b08ac93eb3a4b0676d486bc68ba2461886f4a1b8c20cc5a58ea2fb31ce
font_01_sfnt_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16644 bytes
SHA-256: 93372fc8085dd08b1dc091a88e46525853d8fd07581b3e80f45b76d400289bdc

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