Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e2ad3fca83c871…

MALICIOUS

PDF

68.7 KB Created: 2021-02-12 04:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 9cb5c1a2cd6c0ecdd44e8ec698b62be6 SHA-1: e5d0decb5641a79acccec2c7f534bd6e11e9305c SHA-256: 25e2ad3fca83c8714bc3ba4f7432744c05693396664b8892627002a53bef105d
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://baarspo.ru/wix?keyword=interactive+student+notebook+answers+chapter+21 PDF link annotation
    • https://zexuboru.weebly.com/uploads/1/3/2/6/132683252/5686731.pdfIn PDF document text
    • http://nikepexi.22web.org/2010_ada_standards_accessible_design.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/jiHZ5mz/jupukefumedonil.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/cjehb84/duronokikaxiv.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/iiieJgg/1_image_4_words_level_25.pdfIn PDF document text
    • https://cdn.sqhk.co/tawumemikuva/rmDijoI/34059880349.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/mikibetiv/pratigya_assamese_serial_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/xefidiguninit.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/45522604408.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/74406991055.pdfIn PDF document text
    • http://sobupedu.rf.gd/33906775227.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/gilobojavosubigod.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/bsc_part_1_physics_practical_book.pdfIn PDF document text
    • http://fosikim.epizy.com/87848020938.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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 5604 bytes
SHA-256: 0981c5c2406217852bb9741d1cac427217495362b3d8acd2a230548d9e8c595a
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 9872 bytes
SHA-256: 819b48c9a9b145fada9cfa2ba84212eebe3f3e0a6990b1e9ddfddcdbdef28016