Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58822b7c64a28d4…

MALICIOUS

PDF

65.8 KB Created: 2021-02-04 23:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5ff460cd63358fb2471ab92a3675836b SHA-1: 81637f0630126345d7cd3df78814bc735f580966 SHA-256: d58822b7c64a28d40e56bd9d764091259202383178e444f0a8a8f77e24ccc153
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wb?keyword=bachianas%20brasileiras%205%20partitura%20pdf PDF link annotation
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/garinosup-nipejatozadikuz.pdfIn PDF document text
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/nodojamilenet.pdfIn PDF document text
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/tipisevide.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/android_webview_javascript_open_browser.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/4160463.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jcjePaW/favafoniripulud.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/50U7NW5/48608699914.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ERggzgi/fikivododik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/takurugilij/11480295047.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/948475722.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/td_online_assessment_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/83323056332.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/ccleaner_pc_2019.pdfIn PDF document text
    • http://wamowif.rf.gd/cinema_hd_apk_for_windows_10.pdfIn PDF document text
    • http://fawepajemug.rf.gd/59163012856.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 5556 bytes
SHA-256: 54b6a1aabdc8cb695190cd67039673adb3b10c7678010338eb30e848a529f644
font_01_sfnt_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 13044 bytes
SHA-256: 6fc5a7d8391b4aee00b857efdeba0b83537aeca0cb39c52df6ef4b3b484e3242