Malicious PDF — malware analysis report

Static analysis result for SHA-256 13816ab7851a420b…

MALICIOUS

PDF

78.1 KB Created: 2021-02-16 09:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9e3ec6b57e49ba8b13cede4b5ac951f3 SHA-1: 4e5af25af11c948c2b71e8f31c576bc5ae1d8567 SHA-256: 13816ab7851a420b50dc2e857407875b39fab630fdb4aab42fc7e0748b58e03c
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://jacksth.ru/aws?utm_term=dream+mp3+to+midi+converter+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404116/normal_6017d81d40548.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/964254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409826/normal_60023959c46cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411511/normal_5feb7e53d25d9.pdfIn PDF document text
    • http://shoop-fl.ru/dell_r740_server_datasheetwnd86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5fcd6e292f653.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/hbjgokQ/movistar_plus_tv_peru_programacion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5fe16b9bf23bc.pdfIn PDF document text
    • https://cdn.sqhk.co/vejanozugova/hIgdibi/retro_racer_cykler_til_salg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf09f1a90db.pdfIn PDF document text
    • http://alex-chekalev.com/3d_java_games_360x640hu55x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5ffe73bb53e5a.pdfIn PDF document text
    • http://luchdobro.site/kuzobojoligilar5x21v.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/hdKXjEi/14854232696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://papawipowujujed.rf.gd/gmetrix_templates_folder_missing.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_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 5436 bytes
SHA-256: 27da7222aaa9efc52ad454d6d74d0b1fc5ab5f1ae658455f8368ad3808a2c0a3
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10724 bytes
SHA-256: e7f6d7cae72615cbd5089b50c5cbf707b616994373424a1f56f8b2f1c69c6afe