Malicious PDF — malware analysis report

Static analysis result for SHA-256 28739eb3be0c5fdf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 11:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3d8656d628f2037a237d149a66aff097 SHA-1: 439eba1555c23c3ae1f2bb9f3e2547b0589b3cc7 SHA-256: 28739eb3be0c5fdf9a87f87ef3fb36646cac105ac062fb2eb28089acdb8e7cdd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs suggests the PDF is designed to redirect users to potentially harmful websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable domains for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://weldingplaza.com/files/file/xivigavosededipodokunezog.pdf In PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/30581757678.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/72828048191.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/luzurovafej.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210903024658.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/vavexizofodaw.pdfIn PDF document text
    • https://interconformity.ro/images/file/63859763805.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161331713d7e2f---45832642241.pdfIn PDF document text
    • http://ave-france.com/pics/files/5189757873.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/42217967951.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/vamizaralogeb.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/43623696715.pdfIn PDF document text
    • http://alkanboya.com/files/file///nelanafa.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/53839677708.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/99055599460.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4a8ca28d---62274437747.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/89571446294.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/fusirijajilowedejuwumir.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/88261475334.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/65923193780.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210909105124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=romsmania+ppsspp+gtaPDF 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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 18872 bytes
SHA-256: 3d68b85de07f947d745a813e6380dfa88775cffd401c25c801a273348dc3b04a
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 10364 bytes
SHA-256: 2e1997507b01a21a478b016dbef9e1f6a24f685d861a92a88664ae4e28d10919

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