Malicious PDF — malware analysis report

Static analysis result for SHA-256 b136ccdd213b0ba7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 09:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13f963d286e81773b6f9fc5aa1134bb5 SHA-1: 0fd46e1f7fb56516fee561ecac8278aefcd2b933 SHA-256: b136ccdd213b0ba7ab515d72bb13eefbeda59299fefdb9d429dc46708b5cae3c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to unknown domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://mercerapparelss.com/userfiles/files/litudojaruzosonaxavezavov.pdf In PDF document text
    • http://alatasfilms.gr/ILC/img/file/12585959163.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/xeneximotekadoxufusata.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/99352637815.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/48987383308.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109031324193882.pdfIn PDF document text
    • http://topstec.com/d/files/14524500241.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kasakupugiwixugibowara.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/54854000319.pdfIn PDF document text
    • https://telorgabus.com/contents/files/72010510814.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vnt32vs0qc5krn4s6mrc92beq3/93282431039.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gizikunidefabonagum.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/57098907936.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/65588712658.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/90591163018.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/8544136490.pdfIn PDF document text
    • http://z500.si/files/51923904485.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/98895083369.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/jexogunevamezigo.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/wiwugezodeki.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/55025340169.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/taxirirag.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/jopuv.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/10768247667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+v+apk+download+for+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86E 17820 bytes
SHA-256: 438f0c910b05e397bbba698da855102805ba5f68da0831b5e6a9970d8ab40c79
font_01_sfnt_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 16668 bytes
SHA-256: 3822be9472fe13c42d0ff50a886b9956278fe150956c433d720366da0974613b
font_02_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10516 bytes
SHA-256: 7d0c838e7c6bed5b9bcf92fd792f9b1933accc4d284e8bb24def33d78e54e13d
font_03_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1