Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf36de2caa36347…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 15:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ec08eee24c010a6390e7a1747de6efb SHA-1: b3c19768d7ce6ef7bf7b6d1974cb19de3986937c SHA-256: eaf36de2caa363476e35540d3ae90e96a03308c470bd215a03e4964238d2cc01
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=fortnite+hacks+pc PDF link annotation
    • http://guojingmall.com/userfiles/file///508472572.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/sititevan.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/zusaxolomibano.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/85876490164.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8471cf37b---74550582685.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/vuwepumogesobagibepinuri.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/82386554041.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/91296553713.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tuter.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/nigun.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/kugamebafedunosamulasinoj.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/67729543617.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/55818575078.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lalalelo.pdfIn PDF document text
    • https://cecprint.com/images/file/bewotomulizinoku.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/95704100579.pdfIn PDF document text
    • https://noitiethoc.com/userfiles/file/57725591430.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/45615820583.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/vetatixoninuzod.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/85335401046.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/lekelaxoperezigaduw.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/57184067290.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/gemuzabenatuzasil.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/16178523707.pdfIn PDF document text
    • https://retta-bg.com/userfiles/31215357172.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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 18168 bytes
SHA-256: 7b4d8c88cfb50fe8db22ae4f7a0fa0d2eb07daa9a9a7192ea535ea6e32575356
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10492 bytes
SHA-256: e00d27998ad6ee1cfe4cf0f3a04ba583f9116cc7c3b851b0a68a319a3f409d1f
font_02_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1