Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7718ec683bd1f9…

MALICIOUS

PDF

89.8 KB Created: 2021-03-02 22:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fca5878905a2110e6cfac37a0f6e6b1c SHA-1: e9b342c5d2e02a53072c563583cd5f031a49e102 SHA-256: cf7718ec683bd1f905f1aff860bba11168c9345a7477899bd9123fc49fcce317
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to a movie summary, intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/award?keyword=the+monkey%2527s+paw+movie+summary PDF link annotation
    • https://cdn.sqhk.co/lexoxuxoluvi/hhghtgj/95566685598.pdfIn PDF document text
    • http://mejagudabukode.iblogger.org/free_beginners_piano_sheet_music_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/IiiJjgW/fabulous_fashion_fever_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/WjasoSW/box_packaging_template_illustrator.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/gRjaGgc/simuxenekezonakoruzu.pdfIn PDF document text
    • http://pipvip.ru/games_that_can_be_played_on_acer_aspire_e15i22bp.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/jiBhdii/the_ordinary_serum_dark_spots_review.pdfIn PDF document text
    • http://5gusevshop.space/free_spring_worksheets_for_pre-_kvhnsi.pdfIn PDF document text
    • http://begezuwoxinum.iblogger.org/fuxodevubezidomaxiginisiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/XB2gdcJ/moberir.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/P8jgjed/94343677644.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/hie32ie/5040088423.pdfIn PDF document text
    • http://liolika-rsya.ru/blueskysea_b1w_android_appziqn2.pdfIn PDF document text
    • http://jakor.pro/manualidades_para_nios_palitos_de_helado8ozea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizusosikirizi.epizy.com/what_is_the_difference_between_total_gym_xl_and_xls.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/pizusugudeximaguzasejodu.pdfIn PDF document text
    • http://dukedofabi.epizy.com/83007333216.pdfIn PDF document text
    • http://jopavufugas.epizy.com/37234805386.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/60108000411.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_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 5328 bytes
SHA-256: 2fcdbe132c68c71f337aeba339a8ecd6914a541fba6f6c06ea1e4fdc4d9b4964
font_01_sfnt_off000135fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FB 10360 bytes
SHA-256: 8c02f8d1910efee85520c3d353f0b82d7d56efa57edfbd04f6c2ff63f3434732

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