Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d3fad84340869…

MALICIOUS

PDF

106.9 KB Created: 2021-09-09 11:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f594fc5094fbc23f2b65a278f3462628 SHA-1: ff1939508b3fa41c394b8c9cc8dfd92a79b450c6 SHA-256: ff2d3fad843408699fd26e8585422decaac0b8ec14103af6d052283d1946dae9
134 Risk Score

Malware Insights

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

The presence of embedded JavaScript and a high number of external URIs, including a link farm heuristic, strongly indicates a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection further support this assessment, classifying the PDF as malicious and a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=android+sistemi+pil+harc%C4%B1yor PDF link annotation
    • http://finalstage.biz/js/upload/files/dimilusepegosaxuwusos.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/vixijetaregorofojokiwogix.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/14385401753.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/58956987592.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135159a2ebbe---55799097782.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/bavajuko.pdfIn PDF document text
    • https://irantruck.ir/data/file/28324449023.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021941911151864.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/52974694728.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/bitogosobevivugofegoruf.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/63506768429.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/33217560981.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/bimod.pdfIn PDF document text
    • http://katachizu.com/img/news/files/89695576676.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/91165171859.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/73820019868.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/saxiketibu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/77842479560.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/21358180471.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/tabenoni.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/dofopusiwiv.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/menov.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/japatuburewigejebepedas.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/wukobosolobufonuju.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_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 10920 bytes
SHA-256: 582fced8b913d5c2c2657422ed7c43b487fea7e54961818212f8768572df3339
font_01_sfnt_off000153f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F6 19388 bytes
SHA-256: ac35224166b2f0715d197cc23b00028b2ab6c0859be882f64a4364d6c65d1928
font_02_sfnt_off000183cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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