Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c63ab7f1c8beb77…

MALICIOUS

PDF

67.8 KB Created: 2021-02-13 08:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9030f882404bbdcacdbb849483828426 SHA-1: 6d25d05c8388c01605db5cf4b94950ed5e6d9369 SHA-256: 9c63ab7f1c8beb77f97474e5e44c9662ca2d9b43df2bdf317b5fe4d3d8aae7fc
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wb?keyword=evaluating%20functions%20worksheet%20answer%20key PDF link annotation
    • http://microdigitalmeter.xyz/49541602923hw13t.pdfIn PDF document text
    • https://zomurigokolu.weebly.com/uploads/1/3/1/4/131437535/fonuwaberis-lugulawafisefo-xunaz-gagod.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/jikok_kamumazore.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/c4e1387499.pdfIn PDF document text
    • http://innov-cis.net/komunetirugarosavu2njnq.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/zijajimoravuzu-pisudipewogut-kinizefon.pdfIn PDF document text
    • https://leponinidokawe.weebly.com/uploads/1/3/4/5/134502666/3304626.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/1548060.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/fujadabez/sheet_music_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/1131075906.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/paziwevotutajolajem.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/45635425244.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/recording_current_liabilities_on_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/pafevorejibujubekekuwope.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/52105941980.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_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 5420 bytes
SHA-256: f3d0a94179a21c0e15755d2b35844e2a40c7cbcf0319f0dbfd089bd6c9103b9f
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10308 bytes
SHA-256: 83c888825f3eded826a0bb72b47744d19c33bb87f83f06f35cc1e63e39b8f72f