Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e73d0449e77156…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 03:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5f422386d4fb49a6660fcffe9c731491 SHA-1: 3fe1432ed8cc68f5a101a6a948c1b5cc6071b046 SHA-256: e3e73d0449e77156d34249d456d4e8ea09368256c07a75949d560fcae72623df
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=puffin+tv+browser+review PDF link annotation
    • https://thietbixanh.net/uploads/files/dediluvixugi.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/badetiwaximonotipibajuvub.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/pumijizizetitam.pdfIn PDF document text
    • https://megashina24.ru/files/files/dobonadakuluxuwefemovi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///4836668127.pdfIn PDF document text
    • http://grimastone.ru/files/molubolivut.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uu038oubos661n5k6oorii27v4/rejagukezibudekodizikowuj.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/mubovegifesokuzi.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/6221120220.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/92054271979.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/23913732014.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eccf8b261---75987467689.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109081917521130.pdfIn PDF document text
    • http://thepducphat.com/upload/files/69681541744.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/guxupukox.pdfIn PDF document text
    • http://abc-tel.ru/data/File/fuzuzebokexa.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/lunazukofitafizel.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/nekobivudapubi.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/71831135069.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/90954496720.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/nojisewodubaxisura.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/pegokoliseke.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/widubasonoxavegisimi.pdfIn PDF document text
    • 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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10392 bytes
SHA-256: 99c63d3b67e92cbbe99c31681dc1c925056a867dabf72f28ebcb1796dcb33289
font_02_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 16868 bytes
SHA-256: 848c276aa5b5841938fb16782eb6bdb4f4886af1cb1f509c88309ca0fb05f9cd