Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9184e41c12f5cb0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 16:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 121e2f7a396ba3a16df757a02d80045a SHA-1: 913d72349328e9f897679cfbc1f60dd31de45a99 SHA-256: f9184e41c12f5cb0d87784f37ed7d2f27cdbe552341ea21e4f38ea3d85aaf9ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ristoranteibucanieri.it/userfiles/files/loxaguzarugodezejuposa.pdf In PDF document text
    • https://dhrc.in/userfiles/file/36784152985.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/427078b1bb428c3150ac5544bcfbba51/gobipobosit.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/88221750674.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090204500392.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/pinamubukupisu.pdfIn PDF document text
    • http://deltools.com/userfiles/file/56520671887.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/sisagabumo.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/75502848153.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/61353706154.pdfIn PDF document text
    • https://asken.as/bilder/file/49982398427.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/donutonokobuvof.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30377807537.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gadetajujidipi.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/29312026897.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/jakizu.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/16837876569.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/85414186534.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/vikaju.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/83554485459.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/bilowuzovup.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/69999510087.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/92820093800.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/56775421920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+kings+chessPDF 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_off0000b088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 16744 bytes
SHA-256: 82cdb11d926ef73ad6e71ca69b7b01ba0d7d1d85cab430762d568f6bf530d05d
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10540 bytes
SHA-256: 948a352aec2f5ff30c65438348db0a15da2e1c006052870c9b6231c048bf0439
font_02_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.