Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1968f1245135418…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 13:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0852bf4b77282b92bba15e33d3fe6038 SHA-1: a8621f4ffedc1d3823a4b3dcb29419debbf88d5e SHA-256: a1968f12451354186ba8267214d15eb6b171f79b871dd8a215565845f3706d0a
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and exhibits characteristics of a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a deceptive user interaction. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=kissanime+ios+download
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/13657270599.pdf
    • https://wineuniverse.us/userfiles/file/wixomidajelifitivabudobum.pdf
    • http://irinaburmistrova.ru/files/jilekukuduputijitutosi.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/jebesalopezapenowol.pdf
    • https://binarbaid.com/public_html/userfiles/file/35793203117.pdf
    • http://fukaofoods.tw/uploads/files/202109132351349901.pdf
    • https://alarouba.com/ckfinder/userfiles/files/48370078168.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/64460089071.pdf
    • http://noithatmfc.com/media/ftp/file/risinerevimubosuviwade.pdf
    • http://asude.istanbul/ck_images/files/94701957175.pdf
    • https://bulendengin.com/upload/ckfinder/files/toledebix.pdf
    • http://lignumweb.com/site/webroot/uploads/files/8554311346.pdf
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/69137308899.pdf
    • http://agataklimowska.pl/userfiles/file/88672491436.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/gexozarifirafozobo.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130364124d45---tadoxejixudolezikudato.pdf
    • http://bellamy.tw/uploads/files/202109050357569014.pdf
    • https://kaparatt.com/images/File/tapoberoliri.pdf
    • https://aaaxxion.info/images/file/5730255918.pdf
    • http://handsonmontessoripk.com/userfiles/files/87209508622.pdf
    • https://dcicz.org/userfiles/file/fagevanedamewi.pdf
    • http://rydelko.pl/userfiles/file/zadalaki.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_off0000d1ec.bin
aeaedac86cfcd4661ff3f4a5066f54241cd1af661eefbad3e4555c98b3af5a6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 17896 bytes
font_01_sfnt_off0001001a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16792 bytes
font_02_sfnt_off00011831.bin
b3f74f24af73b4f04721472a99bd8ab321831ffe0944ef26feca0e70954f27bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 10288 bytes

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