Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faf983fa4d69632…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 16:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3f50ddc4abc0300aaa4bc6e0e7c1def SHA-1: 52215919203528e784c41e9353cc92f0e46cd893 SHA-256: 6faf983fa4d69632262915067e1cc112bab0484569c4865b118d659f4470f568
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://hsse.cl/files/41640823944.pdf In PDF document text
    • https://cartolmania.it/file/18390948066.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613283fb6d424---fivuwavoguvedazejaxusikef.pdfIn PDF document text
    • https://phr4u.com/files/16986372604.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/gebogakopofekukosak.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/wikudejesop.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/76120610583.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/52827750503.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/pexepolovugazebi.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/11852125598.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/verasasifawoxirevevekefe.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/jelazurilaf.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77765132745.pdfIn PDF document text
    • http://ebus.cn/up_file/file/98916834953.pdfIn PDF document text
    • http://empezo.xyz/js/ckfinder/userfiles/files/vijaziwexoxuretuvux.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/13036350302.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/narenogugorasovixunux.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c14afa1cdd89f6aac2c5ad2090184adc/wigejobuxadunutoxovuloku.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/579082508.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/63678123429.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/zokazowufetuwutekabisoj.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/ritekezazofutepumifanozi.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/39998288357.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/32673011648.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/344856665.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/26628384551.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/15611001090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hatsune+miku+room+wear+verPDF 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_off0000bc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 10560 bytes
SHA-256: 55a6f4176a46bf6910bef39450dfbb20b6ccbf546f7d450862580fd2cf1bdcf8
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16980 bytes
SHA-256: aeba0dd26c85b6714a8eb719b0c05ecf76c3e5761af4cdd0947f2e581404faaa
font_02_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1