Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e016257e8ae1b84…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3e82a56456df3e806092ac9d12febef SHA-1: 8ea518e1c45b6a77205487272fa8398e21093268 SHA-256: 0e016257e8ae1b84569ae58cf865e79c6a1667cde8770f6aa98ce4d507525143
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=chinese+speaking+countries+in+the+world
    • https://www.abrasco.org.br/ckfinder/userfiles/files/rixedikolikonos.pdf
    • http://saddabro.com/userfiles/file/gudiwimojazi.pdf
    • https://alpinashop.rudy-ra.com/files/mogizudemumutud.pdf
    • http://nagakuratrading.com/js/upload/files/zozub.pdf
    • http://syntra.pl/userfiles/file/60513674576.pdf
    • http://homeopathyhongkong.org/files/ninujurigezulelutudiju.pdf
    • http://paglialonga.it/userfiles/files/mazenatimadoxasaligodotil.pdf
    • http://intertermo.nl/userfiles/file/34028930370.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c97c3914488329167bd7beccef8254cd/jizasixujig.pdf
    • http://vuoncotichdep.com/upload/files/47891655928.pdf
    • http://datacomsystems.cz/userfiles/file/52121617455.pdf
    • https://myvideoclasses.com/ci/userfiles/files/resilowipalunujotonuda.pdf
    • https://langumeistras.lt/i/File/monizipope.pdf
    • http://4x4autok.hu/userfiles/files/xejad.pdf
    • http://rvhifi.cz/files/file/mukururure.pdf
    • https://digbijoynath.in/uploads/userfiles/files/likufera.pdf
    • https://vzglavniki.net/data/file/juridirapufeximolukurisov.pdf
    • http://lavalnerina.com/userfiles/file/zolow.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/91645722589.pdf
    • http://www.jysunshine-hotel.com/up_files/file/dajuvegarik.pdf
    • https://intersensor.ro/v2011/Files/fck_upload/file/91248115.pdf
    • https://408of53crownstreet.com/assets/media/files/lodejitogibo.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/99088275616.pdf
    • https://rowadalbyt.com/userfiles/files/pofanataxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c72c.bin
91159d57f2d628c1731f6bb45b29ff0034500dd312003d11311a8760c2f32343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 11104 bytes
font_01_sfnt_off0000e0e9.bin
cdcca670ed731a355107e1a6cfa307f7f8a07300e1523f6521556d6e01ec2e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 16724 bytes
font_02_sfnt_off00010b8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 16792 bytes

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