Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90ad15785fd7ca…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 07:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee929796de17e03c7b2999bb816749f0 SHA-1: 2e2a28043f38ed6be84b47d5af8bbdb1446a361a SHA-256: dc90ad15785fd7cab2dd3cca90f443a0a43e14dc9abf2352303ce31da2a7c440
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is classified as malicious by ML models and ClamAV. It also functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download additional payloads or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://autosvilar.com/uploads/ckfinder/files/lererek.pdf In PDF document text
    • http://precisao.org/files/files/dowupukitamoliweledubepe.pdfIn PDF document text
    • http://kalikraft.com/images/file/monoxadava.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/zowirokapanuj.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/51036300616.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/54670671111.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/56937040489.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/51747011603.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/369ca0a32d0b7a14f0b31264f8807aa0/derokoviradilakeralisuzu.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210908074945.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/vulolirelom.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/laxigegigexinexuretatud.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jexedesaromix.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vezujutojolape.pdfIn PDF document text
    • http://ccsl.asia/files/boribiwadud.pdfIn PDF document text
    • http://aurora-c.jp/files/files/79662325362.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/robivigakikatedenet.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e63c4a250---36154612607.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/voziparubir.pdfIn PDF document text
    • https://seikai.jp/free_images/files/98845058887.pdfIn PDF document text
    • https://kristinanamaste.eu/files/23391873296.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/fabazowe.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wawuvomakuzapegulijofora.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/82599728344.pdfIn PDF document text
    • http://ailizia.com/userfiles/vonuloditavaregel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=house+of+wax+streamingPDF 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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 10788 bytes
SHA-256: c02eba1b1306e27cd1472807c84c041a1ade9b6efc3047be1e348f5a39bbf929
font_01_sfnt_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 15908 bytes
SHA-256: 03afbe3368a045529be7ee0bb1380a2d443a4eb33bde6dbaeabe39581c572a35