Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b1bcde7680ef25…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 00:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eabbb9b116cdb43df58fc243942e18c9 SHA-1: ac1cdd9c6054185be90d640f07c40526985faba4 SHA-256: 47b1bcde7680ef25ddf4e0aa76e9fa71d62768f10b6004c8451572e03cd6be15
134 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. It contains embedded JavaScript, which is often used to redirect users to malicious sites or exploit vulnerabilities. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baust.edu.bd/app/webroot/ckfinder/userfiles/files/72512469706.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ve7b24ppqchqgm9pcr5cnq8m7s/33728924416.pdfIn PDF document text
    • https://energooptima.hu/upload/File/fagirofewarulo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b3418fa0---34245367064.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/9821867484.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/84419784340.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/jurizevitulegutedowapewu.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/97313477164.pdfIn PDF document text
    • http://abc-tel.ru/data/File/56404800898.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/vurozeta.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mexef.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/85382137522.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/nugorakazipinusasupubi.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/30680069284.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/64143642391.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/52274067397.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/17682656373.pdfIn PDF document text
    • http://erex.hu/upload/file/wanuralajotilekoje.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/96355701189.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/rukokitelifesokoramon.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/furidobenodenosebud.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/71516949013.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/dewipedulilinamaloxa.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/madasegisumazimipopinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vue+3+ui+libraryPDF 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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 10108 bytes
SHA-256: 3a2bf732f252a4867afa4db3a416932ca6214323826215c0f90472639d1cb91b
font_02_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 17240 bytes
SHA-256: 34d6f1c39662a2876d4e94c9c957e78e28a8bf2cc14edab4b6fc072256de3f6c