Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1782ec24c7a149…

MALICIOUS

PDF

73.5 KB Created: 2021-04-23 22:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7eb4f8295ae95de0ff6a775cb99cd21f SHA-1: 86dd3649f4f921393fa95333bdcd437abc9069f3 SHA-256: ea1782ec24c7a1493b28bdc5494ef35067ecf06b455a7527a77f4932f1d1ad11
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=league+of+nations+japan+germany PDF link annotation
    • http://mokemowowove.mygamesonline.org/types_of_entrepreneurship_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/iiiegjv/filanajisimi.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/dorofoxorixir.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/hdiiLge/lemon_pound_cake_recipe_with_instant_pudding.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/42042118812.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/83225756848.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/81364058636.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/VmZblfT/carrom_board_3d_model_free_download.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/abs_and_squat_challenge.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/43829241848.pdfIn PDF document text
    • http://nositadox.mypressonline.com/for_elise_piano.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/vobajufilugotumasat.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/bimal_kar_galpo_samagra.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/gjrrgfu/maximum_carnage_comic.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/0hcGqOM/38903765722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabelame.atwebpages.com/gojoxararukanogejuneli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c12871-1695-4b0f-95ae-3e43920f3b4b/23001595764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0d1521-ef68-4785-b1f1-310f7779d042/why_would_a_monitor_say_no_signal.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/myself_essay_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4cef4a-a029-4d0f-b9dc-fe0f0ef3f477/what_is_the_difference_between_relation_and_function.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/shaded_red_smooth_dachshund.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5308 bytes
SHA-256: 9f5b792b933578ab51f33cc56d24092cc18c1ab6c891c9feff3f4df27d871b4c
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10188 bytes
SHA-256: c40451c454d478889fe4341e1d269efd440aafa5b70ffac8a3e78cd85093b920

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