Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff5b8c9ed359cd…

MALICIOUS

PDF

76.5 KB Created: 2021-03-22 21:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3eadd6f9f137679d65bf23418098435 SHA-1: c891797eca5094df06a695a3df871d8338307350 SHA-256: 53ff5b8c9ed359cdcd49acb606e4b91ce11097ae26f68d5ef947a6cc0b30c96e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a lure related to drug use, indicated by the document body and the URL keyword. It employs an SEO redirector to lead users to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=bahaya+penggunaan+narkoba+pdf PDF link annotation
    • https://cdn.sqhk.co/mudonisogub/jfcLlhb/accuradio_most_oldies.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/63042283921.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/ccsk_book.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/cables_and_wires_nptel.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/camera_scanner_to_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/id2Jgce/music_visualizer_maker_online_free.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/79556603542.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/dovulavavo/jigojijeruzabigitowejir.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bare_trees_primary_school_ofsted_report.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/ferrari_california_2020_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71a4c95-d91f-4afa-a466-24d943094fb6/irregular_verb_tenses_list.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/14992183292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1654119-6662-474c-8a08-ccfdfa7e1c80/88684229783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c02efa-29d5-445e-be70-58d8f4b1e4cc/blender_2.9_tutorial_deutsch.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/moxizibuvoginatopuza.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/41170191929.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/82557414068.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/lovibarodowusunidegofo.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/how_do_i_turn_on_my_jam_speaker.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/elementary_statistics_a_step_by_step_approach_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/69496490390.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/wejozapukalofazole.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 5448 bytes
SHA-256: a56b4e11e5d52e305c0973acdf3019c816286fbd82d3b063c493410bc271a725
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10036 bytes
SHA-256: 043f6b38bb90787c7c2f72db3230ff90e8e0b33c18d625c91531c2cd17c2fdf9

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