Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd0329e7f9d0198…

MALICIOUS

PDF

99.3 KB Created: 2021-03-27 09:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6836c2692429e779aa901f050ef1c5ea SHA-1: 69f75cf92f8e6abbef5f6e51144dec4ddfcb6cee SHA-256: bcd0329e7f9d0198e9ef4db37c2b7d02f1fcfa6a56b46b78ecb1383fda7138b1
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://druttle.ru/award?keyword=arabic+numbers+1+100+chart+pdf PDF link annotation
    • http://teksol.xyz/que_estudia_la_historia_contemporanea0s9p3.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/robijadurote.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/25126124313.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/list_of_sports_and_games.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/iijigeP/metaphysics_examples_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/xabiximakef/jjjj0ie/kemadexawemutekelo.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/aged_care_guidefroj2.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/ihfAzln/97620790090.pdfIn PDF document text
    • http://homeolimp.com/hp_photosmart_7760_photo_printer_driver_downloadurm6o.pdfIn PDF document text
    • http://copyrighthelpcentral.com/luwifidofudinufamibz5hwa.pdfIn PDF document text
    • https://cdn.sqhk.co/simixejazir/ihrbSbk/wordpress_admin_login_loop_redirect_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/jggjUQz/ielts_speaking_latest_cue_cards_with_answers.pdfIn PDF document text
    • http://sufofure.mywebcommunity.org/bird_table_plans.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josuxak.atwebpages.com/ejercicios_para_nombrar_alcanos.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/58887732148.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/nc_durable_power_of_attorney_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/vuvefumuruwupaxasef.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/51680182648.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/see_aggression_do_aggression_questions.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/insurgency_in_kashmir.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/vavodaxubexodovomukami.pdfIn PDF document text
    • http://juborekif.atwebpages.com/clinical_biochemistry_mcqs.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/fallout_3_wasteland_survival_guide_robco.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014a41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A41 29684 bytes
SHA-256: b59c200f5a7d7c028969b6cbc4f9ca82652038c989e5b7377b27f8137fe1fca0
font_00_sfnt_off00011281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11281 5688 bytes
SHA-256: a8c124d5bd2ad00687a5c807332d784150c6825518a69e72fc2b0ddc9d20100c
font_01_sfnt_off000125ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AD 11224 bytes
SHA-256: e18c75bdc5669ab05bd3cef815a51ba8186b72294be685d24820e158651cebfb

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