Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8de9e4a02afedbe…

MALICIOUS

PDF

70.7 KB Created: 2021-01-24 04:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 2a38e7cdbdc9f8caf5150fdc2e555ae2 SHA-1: 9a7b4fcb6176cca867b5d3dbaa1a38a710bf1cf1 SHA-256: a8de9e4a02afedbe2a485111d16e4b9022cd04c3569f5c33d7e9e88703c2f0b6
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://jottigo.ru/aws?utm_term=uk+resuscitation+council+bls+guidelines PDF link annotation
    • https://melinifijegor.weebly.com/uploads/1/3/4/2/134265386/e7286.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/vibov-kikutaja.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/WygiRid/facebook_lite_download_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/ji9digd/daxununowa.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/6402705.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/yic2hcp/jifavejusonuxafa.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/gaduwufapuxopapodax.pdfIn PDF document text
    • https://nazasakodaz.weebly.com/uploads/1/3/4/6/134667833/fitimaxiku.pdfIn PDF document text
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/06473622e107b1a.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/tikofaketonub/tusujetibezowo.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/38578415495.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/bibliographic_citation_in_mla_format.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/kindergarten_addition_worksheets_1-_10.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/appointment_letter_format_for_private_school_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/facebook_video_er_app_for_iphone.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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 5300 bytes
SHA-256: 8d5adc954a763accb3cc78bf31b9e8863769d70d45dcbe0b22ac74f88127b5a9
font_01_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 10652 bytes
SHA-256: 1704296e8fcc219980d09aa5796ec2643c3d3e96ee88ffd60934a8f5bc4e02f7

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