Malicious PDF — malware analysis report

Static analysis result for SHA-256 e544501097a48f7b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 10:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bb6e6e6537aa36861405d51f9359c73e SHA-1: 1e433368de0d927f22a502f2959aa649b3786ca2 SHA-256: e544501097a48f7bdca7f79a60fc68ec1da55c84488ac18493e69b178669537f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ccichn.vn/data/upload/file/nusodewepemerexokil.pdf In PDF document text
    • http://anaminfo.com/attachfile/file/larowusulokom.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/10324051804.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/87726811763.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pesopapawoporodizalute.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/nexuvaribelixidi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/gigenomujupepumidenafev.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zumelumek.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tivubupivalikofupetexufam.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/tevirumu.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/durobuwalerabaweta.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/zijipojezuxuwaso.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/21727061234.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dixiboxenaxezitefudi.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011552485826.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mejezizozuk.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/lafurega.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/53351707.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/59501580674.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/70151087398.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/vijipeximujivisorikir.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/mirupogunenulibebal.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/14889110309.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/78699514180.pdfIn PDF document text
    • http://state-lithium.com/upload/files/33683388580.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161407784063e4---43860265033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+10+cracked+isoPDF link annotation
    • 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_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 17612 bytes
SHA-256: 28d2a1e436f7dc153318f991e5f7231a1b413ecedb6d6194c7bd02d8ab9de25e
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 10564 bytes
SHA-256: 6dad084084f7d161b69f78e1ea45be6b41ab29d99bc634018f43116364aa0119
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1