Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4f6ddd2b82394d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 07:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfb4d093fbe3ae50a5faaa1aeb0c5168 SHA-1: 4852a717b8c9e07993ba658204b68642269a45b0 SHA-256: fd4f6ddd2b82394d18ffbf03dca057ae23b5e734fc96fe99995096ce5fdfb405
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alariel.be/userfiles/file/jorumodolu.pdf In PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/ditigitajosowometub.pdfIn PDF document text
    • http://93564497.com/userfiles/97172342181.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/53300659011.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zisapotubavutafosozo.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/53791510055.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vibunugekanamerisineso.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/39869959130.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/mexino.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/bidogodafo.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/41253454768.pdfIn PDF document text
    • http://edallyshop.com/upload/files/70164957532.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/putasadufikopezi.pdfIn PDF document text
    • http://kolesa.sk/files/52898476929.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/35058235312.pdfIn PDF document text
    • https://techlan.pl/files/file/vulilofafu.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/dokotamelizulepu.pdfIn PDF document text
    • http://chinahongji.com/d/files/sapun.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/nerelivizanekoxoziz.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/13888315915.pdfIn PDF document text
    • http://jsdarvin.com/files/texagemufutebevotike.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/29024554323.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/90291759743.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/68725262822.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_224542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=8+letter+words+starting+with+mPDF 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_off0000b677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 19056 bytes
SHA-256: 445871303e29b202dca9fea14c8d2713775843d0fd141370d639560651d9bd2d
font_02_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 10892 bytes
SHA-256: 374bceb1bdf25a954f3b20bb403b73a8ebb632b18f77c93c954dae2d2dee1513