Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bc1e7d120df63e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 09:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c6ca647b149b37f2c11bf0792a95acc SHA-1: b2437c5f7ff5c4dfa086a5c7b9e14730577fa848 SHA-256: 83bc1e7d120df63e25632b1a734d2acf60d95cfa6cc3ad816ac4d7b9c81a90dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that act as a link farm, redirecting users to various external sites, likely for malicious downloads or phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a deliberate attempt to obscure the final malicious destination through multiple redirects.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=pes+20+iso PDF link annotation
    • https://castilloexterior.net/ckfinder/userfiles/files/gisifofow.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/36184859871.pdfIn PDF document text
    • http://123dvere.sk/files/file/30397710011.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/91527744886.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2108c125---80059413468.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/18731189060.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/89948245902.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/19550968041.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/muvasufajerefupaj.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///96281409890.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/molasib.pdfIn PDF document text
    • http://vhz.cz/user-files/zatedimegi.pdfIn PDF document text
    • http://napiarsaigh.com/images/sisanajewu.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/40176456218.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/64823143258.pdfIn PDF document text
    • http://vitrine-prof.com/files/23174583077.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/sivijupalifesebigapofad.pdfIn PDF document text
    • http://precisao.net/files/files/guduvedipubivewagefop.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/45366516018.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xuzedugobijupozedovij.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/82548952281.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/73220427391.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/89135856641.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vibezosebamunemerutewus.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_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 21880 bytes
SHA-256: b5c0f6414a3a9e1815cd656f65a8636c5fb5412c59062314d3c6c7c4955c4089
font_01_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 9832 bytes
SHA-256: fb9ed138b2bfaec8022419d0de36302154b899d52634020c256e2c4ab60f1e11
font_02_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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