Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aac51dd8c0d74b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 12:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7b7eb0a441cc3f976497fc4e2662162 SHA-1: e1e11819b91ad8b201016b97b25a0b6dea65657f SHA-256: f3aac51dd8c0d74b6274a0759b74e67c631609e603be671a4a5799b33851af94
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=snaptube+apps+apps PDF link annotation
    • http://gramercy-grand.ru/files/file/rinuvefezimo.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/3994641437.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/83821495521.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/79454138291.pdfIn PDF document text
    • http://liily.jp/upload/file/20210907143703.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/42807960223.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/574362529b7c25c744043d3833b817dd/34747867826.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/gololexelufuzu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630468535.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/kenafojadasu.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wenevaz.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wakifafugi.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/68882500094.pdfIn PDF document text
    • https://swiz.eu/files/editor/jokadagunojojogukovu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/49959253305.pdfIn PDF document text
    • http://rrarental.org/upload/file/kudumiwiwodojizotebazuna.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/xikumetariruwomuri.pdfIn PDF document text
    • http://risme.vn/files/11870020562.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pabosojibemitugeguz.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/29809526150.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/9798900877.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/jejujegorinuwalalom.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/18692221708.pdfIn PDF document text
    • 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10200 bytes
SHA-256: 7ebf91a6d454c72b62d25d3abf68df3bef26c48ac4be7895bfada0b8333405af
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17496 bytes
SHA-256: 6b73cce61d50223e69f72dae0ef85126d3c0c9e162adc0e64a5ce34b7483dff1
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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