Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4a4fcc479ddca2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 17:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cf35c9d61f3b202ffaadc524fb68c78 SHA-1: 8336ec3195cba0beb5e2e9885d944486fce5ea9a SHA-256: ef4a4fcc479ddca2d693af0425514bb44d3afc7a645a14aa81622dea73c67f6b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and external URIs suggests an attempt to download and execute a second-stage payload. The heuristic indicating instructions to disable security software further supports a malicious workflow, likely aimed at tricking the user into downloading a file via a visual call-to-action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://catamma.ru/uplcv?utm_term=swords+and+sandals+2+full+version+free+download PDF link annotation
    • http://ahkjt.com/upfile/file/lizupebajijikasago.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/tasor.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/74812501220.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/musefafinarogo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/84115784377.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ef3f6a9---1041445347.pdfIn PDF document text
    • http://sdes.in/uploads/mifuz.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/7542145498.pdfIn PDF document text
    • https://majubesar.net/contents/files/84648517832.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/50796354635.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/19011764030.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/mufewuxujufedavanedelidoz.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78777442190.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210914_112600.pdfIn PDF document text
    • http://ternovykh.ru/content/file/82205314948.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/66479874740.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/rulazuretaveritadunepe.pdfIn PDF document text
    • https://masukpt1.com/contents/files/23793400692.pdfIn PDF document text
    • http://perksys.com/userfiles/file/pefolexijegavizokewiwobop.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/23743073866.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/kekitasotivet.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908032244324119.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/83522305516.pdfIn PDF document text
    • https://hoongnau.com/upload/files/wifexara.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10696 bytes
SHA-256: 72f9d922caa944116a5103f32e1ec90342848cb1d9ad3eea145900f4f50fecdd
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 17560 bytes
SHA-256: c0f741954cb63c48822b26673bc509bc5e0ed4f6985c4e7b9dbb0368b136f179

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