Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb5c2dbf40e0ff7…

MALICIOUS

PDF

77.6 KB Created: 2021-04-03 21:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 47224df3f1006a745d7b792aefae31d5 SHA-1: 5b547873660977816573574b73008a90ea9dab7c SHA-256: ffb5c2dbf40e0ff7b311dd9f59e9cea2c711d7eaf618436abca5e2ee0ed7708b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=names+of+animals+in+french+pdf PDF link annotation
    • https://cdn.sqhk.co/tegatiwuwax/5hdWC5i/blockman_go_online_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/iaGhcLr/launcher_theme_for_one_plus_7t.pdfIn PDF document text
    • http://stavki.link/best_pet_jumping_spider_speciesr85yt.pdfIn PDF document text
    • http://iranianvc.com/94156634841fjsn0.pdfIn PDF document text
    • http://jobs-ingenieur.best/hp_officejet_pro_8625_e-all-in-one_printeromfod.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/GZwjcRM/long_square_acrylic_nails_designs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_a1ce68e9df6949f882300104d4005d42.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_c28d4a2802454ef5a5d1fcaf1711ee45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/76274059421.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/12283749172.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/voreridesavava.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_98773a4f9b544a96a3c7c9b603abc0c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4293ff-d670-449c-b2d6-1380e197e8fc/fenerisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616ef717-2429-43ed-a75d-cfba7adbc8d1/arrl_ham_radio_license_manual_4th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/windows_10_pro_fully_activated_free.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_0be1bfad542c4b2abe5298ca2d681d49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3503d46d-1b6e-44bd-b14e-fa5bafbed911/what_is_the_biggest_threat_to_climate_change.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_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 5364 bytes
SHA-256: ce228109a6990bcb45238104cec6e9d91e5704364699906c8f2daf4ef745243e
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10808 bytes
SHA-256: d99080327e1aa5b3e39281cb86e526ecbd4bfeec17b35473eccec8d609a31e44

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