Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a970f103490af1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 03:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8814e1a28e08af9b8a3297f28c5fe96 SHA-1: fe594c1cefee6be8a552705573232e5a06017322 SHA-256: d3a970f103490af1c3413734d3468f0ae8c7c58f7c1dc278deb8bbbea94eae62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many pointing to link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a malicious intent to distribute further content or phish users. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://azizavacanze.com/userfiles/files/61125855324.pdf In PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/vaxabiwiworatovugiv.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/16614497795.pdfIn PDF document text
    • http://showdoimovel.com/files/files/12193031521.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/89824749674.pdfIn PDF document text
    • https://foulardfotografando.it/file/62619892375.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/90082866773.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/67183638602.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///rijuf.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/bewizakexapupofuvokonu.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/84436865254.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313e82d342a---65560984791.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/dijirutarapoxapet.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/56346565627.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/mogazuvojofigunu.pdfIn PDF document text
    • http://metapolar.hu/tmp/jizujomuzi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zowilezunu.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65686829016.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/jajenev.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/bikuwapura.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/50389260424.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1732b5e0e726f17421233c3346fc8222/togupamukisatenasewut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=idm+crack+for+windows+10PDF 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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 17884 bytes
SHA-256: 0e55213795ba9fd56219ea8116407302d51427193998ec37c205b125cbc1d112
font_01_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10664 bytes
SHA-256: c9116c2c196fe218d0830db53d7aecac26b8fb0014411b2ab197bf0f160f1156

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