Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22e3137b6da4fc7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 17:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 809c02513d4e577d4a38767bd79b4148 SHA-1: 73584ef5d41133478a3b8b5c1a6815360dc8fbeb SHA-256: e22e3137b6da4fc73233fa9a34736ff0729089985f31d7c3587526d69f7993c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to host PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, as the document appears to be part of a link farm designed to obscure the true destination or host multiple malicious files. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://oa30us.com/userfiles/file/zunazabalikowoxuje.pdf In PDF document text
    • http://abwessex.com/uploads/files/mofejufelofoto.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bututiwazimosutixirifulas.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/ropizubujuvijikanatesalu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/53965666357.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/57849654110.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/1509821471.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b5e7042f9dda33ecaa6d1bc3e5071073/pifosovujasanawabaxag.pdfIn PDF document text
    • http://hotechike.com/files/files/binebajew.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/09165129617.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/88537103123.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16314957357048.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/sidikozirerotekafub.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/divitejebinagabupubipedi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/kuvuvi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/96449903126.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gafomelizopalopamexebafa.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/4079993790.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/taxoxevagepi.pdfIn PDF document text
    • http://jsdarvin.com/files/texagemufutebevotike.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jaxipasosojebowes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=brain+training+mod+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_off0000b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E1 16940 bytes
SHA-256: 8425eec348ebd2e11865896ea8dc6ec0dbd52c7751e4d7c9690c47ec6232a991
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 10536 bytes
SHA-256: c2126860c1d24079e8f37792e1fb0ed186455cc90af736a9edb90f4c42c91502

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