Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b306ea049cb614…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 22:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac0db27b66fafe3b2e9ae1e5accec077 SHA-1: c684196633085efe3d6da8ba77da9999b2b7f827 SHA-256: 99b306ea049cb614adebb73634ae76220d47bdbe872d20346b8f5759f2a34fac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, and the SE_INVOICE_LURE heuristic indicates a fake invoice or payment lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards a phishing or malware distribution attempt, likely using the embedded URLs to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://waterlootour.com/FileData/ckfinder/files/20210913_0199FB1D11729DC2.pdf In PDF document text
    • http://frickcontrols.com/uploads/files/18004298835.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a93374856---nafadobo.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913151659.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/43783961771.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/66718596703.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/bikigelulemebe.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xilalebuniruba.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kutazuzevejer.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/xatejalemax.pdfIn PDF document text
    • https://areicon.com/images/file/jozaxaxizeke.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/97011074760.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/81752078744.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/gojuperodaruzulajelike.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/lifofoj.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/lezejegefasulozokosek.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/52360975113.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/polamukoxavexag.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/67412451875.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2891f921---90641833333.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/28398750356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=install+wild+rift+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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 10368 bytes
SHA-256: e7550aef40df92a7561fe823e8c1a974f3e8c253fc4cbc546d75130da49ba0a3
font_02_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 17496 bytes
SHA-256: bcaf402237581678c4df9ed2c1af770dd679e92c8d3a2889702fabd975449861

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