Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0d41fbe0cbc8bc…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 11:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af304787b36848160049382996c7f55f SHA-1: 11c7497ae6c08b78b78735f88da53e00f2d332c3 SHA-256: 0e0d41fbe0cbc8bc8a41c126dbbe31c558cc6d799594f1c20d1abdecdf5fd28f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable domains. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a phishing or business email compromise (BEC) attempt, aiming to trick users into believing there are new banking instructions. The ML classifier also flagged this as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://onlinevay.com/upload/files/63899625748.pdf In PDF document text
    • https://valleyrentals.com/userfiles/file/zibeka.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/mabidazaxotibu.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fegezonewafokerevutafu.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/45082711923.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbb7urt5sse023hcc8321gcqbe/mijepovupuf.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jidisowinabe.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/jepejifoxubopadujibovix.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210904_428DDCA2D2119089.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/63817559069.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/59506594018.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/nadawimiwumikasosolo.pdfIn PDF document text
    • http://didula.ru/img/file/jexajedusazatalivejemive.pdfIn PDF document text
    • https://msvadba.ru/files/file/32180736342.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/96043328138.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/77282246319.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/nulomuxoresezizolini.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/7483087302.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/zaruza.pdfIn PDF document text
    • http://abwva.com/uploads/files/75496524430.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3654633826133ecd979463.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/sixuwogo.pdfIn PDF document text
    • http://dasbluemchen.com/gubonepatonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=unlimited+car+driving+simulator+hack+versionPDF 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_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 16800 bytes
SHA-256: b9b66d6e3c383a2d2f07b6c76ee887d88d6caf925dc6f5dc971f24416b8f3a89
font_01_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 11084 bytes
SHA-256: c07b3fedeb5738430ea90f5f1fa004e917533e920dc4a2b3f1199f05d43cd265
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1