Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efc089b6f841525…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 12:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc387e6d1a2f345d3409646b31cde592 SHA-1: b8271bafc77ae63ffc33a1408bbec2b04310f234 SHA-256: 2efc089b6f84152543c40ecc9b3f048f435d50078992a00f66ed29c5729b7683
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, but the presence of embedded JS and the link farm heuristic point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+turn+off+gyroscope+on+android PDF link annotation
    • http://solarhomepage.ch/fckeditor/editor/images/file/20109819651.pdfIn PDF document text
    • https://adikmanis.com/contents/files/buguta.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/49712961388.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/76494773514.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/lovuti.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/82850428043.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/vonalujuzoraboro.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/gaxatufumodoxi.pdfIn PDF document text
    • https://masukpt1.com/contents/files/fatilolobowatogugimemod.pdfIn PDF document text
    • https://polandpools.com/contents/files/5479842929.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/86984774992.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b699e8af94b1ab6ab31afdefc7329b51/54613806191.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/3407100923.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/70000691112.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/ganasepede.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/20696192531.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/18640824961.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/63882736068.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb8270f7---58679160243.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19326362883.pdfIn PDF document text
    • http://domuran.pl/files/file/19571594657.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/jedifulifisezisif.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210901_230312.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/bisatogorikuzizalirotuv.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/20872404054.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 17004 bytes
SHA-256: d6cbead89d5501b86466ab794f1148251919d1c1e09ac23a00f6189e6e628252
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 11040 bytes
SHA-256: d9d5582b883f743e77c45ab56bbd43258da520d3fb00a20e6c41380ff558ece7