Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e3a20567ca74d6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 09:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb06f8c706dd8947aedc1a7b51154a87 SHA-1: d8bf16943ed9550d8956a3aae271eddba64df2e5 SHA-256: e9e3a20567ca74d62533b6c5dd9febd4758852b79fd4ed44a906fa3a138de9b4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a browser extension installation lure, a common social engineering tactic. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://moriefrusca.com/userfiles/files/jafitoxowadiboruzib.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/34280875775.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/dixezopudovujulowirarovo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/93419133515.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/14702207346.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/xewabawamurisavopimexogox.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/gavebefotibajikubamabire.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/vivaluzaxekojokev.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd87eb8fe1---fejibalepibimodemeboxa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0790d1192---jovizobapepidewuzelidepus.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/45973444497.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/dubuvamavogotafawutapi.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/dizupixomegosulakel.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/65756013505.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wokezofubojufabus.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/30386247844.pdfIn PDF document text
    • http://lecostationery.com/files/file/forubawakazasavebemij.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/gipigebegugalilozisiku.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/56304995872.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/94879153522.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/sagoniro.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/8739386568.pdfIn PDF document text
    • http://zamgph.com/uploads/file/061215304706.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/14115618187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mi+security+keeps+stoppingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001160e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1160E 17580 bytes
SHA-256: 09043d614349ecd944d81dbd90cbe6e0abc0ca62a867e4533beb3f5758b7cb0c
font_00_sfnt_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 17416 bytes
SHA-256: 53bc7f37e021854ef89b2d4ec2837cef5ad0da982dcad75771f402a9d639728e
font_03_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 10640 bytes
SHA-256: eb2163515b5efeae94a9c94c428b747a1b5bdedda1f1ebfcbe70fa8c7ed91b22

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