Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8cef02b003514…

MALICIOUS

PDF

73.4 KB Created: 2021-02-22 02:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 882c8ba2a3931668073bba7bf11bb756 SHA-1: 8e8729d55e54e72982e3cba33b0060649529adee SHA-256: ecb8cef02b003514fe56ab0a4de6d0bdbf94194e44f02239e71094d12868b8a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to search keywords, and the embedded URI points to a URL designed to mimic a search result. This suggests a phishing or redirection attack, likely intended to lead users to malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=the+green+pharmacy+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60241ea3e2495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_6016c714da0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_5fd9e76cdab1c.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/fZjiWyZ/merge_shapes_in_powerpoint_office_365.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/bghjfIi/video_maker_with_music_editor_apk.pdfIn PDF document text
    • http://morpeoplelife.ru/havoc_brothers_audio_song_freel9psh.pdfIn PDF document text
    • http://itgermany.net/mabakolhxe7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_6023f2a412fbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_5fe5f124a84b6.pdfIn PDF document text
    • http://domastmsk.space/how_to_install_netgear_wireless_usb_adapter_wg111v2_without_cdpuulh.pdfIn PDF document text
    • http://pesavobedevas.22web.org/zuvudusatazat.pdfIn PDF document text
    • http://italy50wow.pro/the_crystal_bible_freeye9gx.pdfIn PDF document text
    • http://amin-ukraine.net/geditaxavinelabuduw93tgh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455195/normal_5feb497a01014.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/xubifupi/spoken_english_topics_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/presentation_on_environmental_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/binomial_distribution_functional_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/gigoxebixawu.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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 5616 bytes
SHA-256: 0543c8bb64c8c998a348fbf88436d8154359c19ce3be9bcaf04cb86adea06aee
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 10536 bytes
SHA-256: ac95dd5f2115d5262f1e0e46af90e43a665104dce29b686016da00b17d2f47d5

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