Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a78e81327ecc0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 09:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf2f5fd32db35b91e8d1e318fb1ee4a0 SHA-1: 1c72f4ceff1aa8ff1c8902523eb148ad9bec0509 SHA-256: 999a78e81327ecc04c8bf3dfa5643a17663146772aeab6e0f03a288505634489
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/32851374816.pdf In PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/nutaburasidanemewime.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/gixadijutesix.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/zimud.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161307af1a187f---92457887711.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/13167983421.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/tojowaxasoruvonuter.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/85567387762.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/47754414025.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/18384032448.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/92927488158.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/30443960052.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vadafupebofer.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/38538198312.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff547ecb3c---pufagodetusatat.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/85716410683.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/35821344358.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/56128931856.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/60240876362.pdfIn PDF document text
    • http://vititanon.com/user_img/files/kukidujozekibadameniv.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/jugope.pdfIn PDF document text
    • http://hmed.vn/upload/files/kosededubezakofemizeb.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/vigel.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/17450946970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hola+chat+apkPDF 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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 16968 bytes
SHA-256: 38966a6e97ded55ea4bf75c0cf2558fe7f8a00504dd30231c4608fabf007ddf4
font_02_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 9956 bytes
SHA-256: 6a5e582f96dace029191a99d157d2c1e8ae14928830794fc5bc42b9d330c5849