Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed76e297b24d7ce2…

MALICIOUS

PDF

78.4 KB Created: 2021-03-09 04:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 584ae0e1ac09e9c9cca9c586eab0d12f SHA-1: 2fff00583574273500f019196a860289c27123fa SHA-256: ed76e297b24d7ce2f25f9517cf7127434645f0e696041431565698c5acf1e767
66 Risk Score

Malware Insights

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

The sample is a PDF file flagged by an ML classifier as malicious. It contains multiple embedded URIs, with a notable heuristic indicating it's a link farm on disposable hosting. The primary malicious indicators point to external URIs, suggesting the PDF's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=advertising+vocabulary+pdf PDF link annotation
    • http://tuzogat.sportsontheweb.net/tubajapesamifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_5fd5f4a8a59eb.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/gfZoehh/63006265593.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/hzhaicL/bejeweled_classic_appvn.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/eragon_book_1.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/cedulas_do_brasil_1833_a_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_601a817deebb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_602cf408d497b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fde50ec0d843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5886be-f4e2-499c-b323-e73d993ea719/netgear_wnr3500lv2_admin_password.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/what_is_the_best_vegetarian_food.pdfIn PDF document text
    • http://voranomozupit.epizy.com/krugman_and_wells_economics_4th_edition_answers.pdfIn PDF document text
    • http://xifabopopotesa.epizy.com/kathaigalai_pesum_audio_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975b9b0d-3397-48d7-a604-8af81601828a/league_of_legends_patch_11.25.pdfIn PDF document text
    • http://fuxedozet.epizy.com/how_to_take_better_pictures_on_iphone_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1aa8ea1-ec35-42fd-992b-047423c6c0be/connect_trimble_tsc2_to_windows_10.pdfIn PDF document text
    • http://penotumupemu.epizy.com/bamokeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cd2245-99f9-4979-9668-2f42bddcb0a8/chicco_keyfit_30_infant_car_seat_nottingham.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/nekazovumolos.pdfIn PDF document text
    • http://wiguzod.rf.gd/92267659785.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/rulogewitekuzisezenojumol.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_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5616 bytes
SHA-256: b9042676b95aa9ce72ca7926346ac7cc939851752a0fa0a3b2aa08384f5301ab
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 11284 bytes
SHA-256: b18aec83c628fc302ab6c295cd1e3ac8421a25a32ccf402cdec26c530ca1101c

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