Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3d9eb4cf7cba73…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 21:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4b80799e6029fa1531445ac2359e229 SHA-1: 9fb0afc69ff7ba237ce017c8850509dce8641e1c SHA-256: bd3d9eb4cf7cba73d88040da4b927d1f0835927c3e23d5604d6424c4ef3c45a5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many hosted on potentially disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def0dbb9d4---16825870296.pdf In PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/6503322234.pdfIn PDF document text
    • https://langumeistras.lt/i/File/4504124054.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/93157558638.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/15312336300.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/1188843507.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/63514407588.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/pijovijuborudukan.pdfIn PDF document text
    • http://freeorden.com/media/file/63459317201.pdfIn PDF document text
    • https://congchung7.vn/upload/file/vorepaw.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/nubozejerarebadu.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/53793140859.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/sosoruwipazaki.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/788a38c1cf1b83476b31a177ad1ea903/suvod.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/68437924216.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910005751.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/2326321927.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109100127466550.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/14314364303.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zelivuzizonifu.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/kitevobowevoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=root+samsung+ace+plusPDF 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_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 10668 bytes
SHA-256: 6ea2a27f1b98769ff73173706648fe9fed681acec64fda1ea34be9a2b69e390f
font_01_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 17372 bytes
SHA-256: af0281c30d21d27206bb0fcf67a6d9f829e113289256110d2dc4868937aad2e9