Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac1114c36b6d052…

MALICIOUS

PDF

65.3 KB Created: 2021-03-11 06:08:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 640794a23328f7ec30666df63403ee92 SHA-1: 3ba042d883783eb6b2135d68ca5de5ad531ca180 SHA-256: 3ac1114c36b6d052c7464c6d2f11b6366ea1e65e30fbbb1bc24f0edccfec7cd2
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially harmful content. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=bhavans+eroor+report+card
    • http://mosuxuvemuzuwex.mywebcommunity.org/jiddu_krishnamurti_tamil_books.pdf
    • http://fresh-ita.fun/what_are_the_different_types_of_electrical_wiringwo85n.pdf
    • http://xomutukegadoj.mypressonline.com/61360666957.pdf
    • http://jobware.pro/92323927484y8euz.pdf
    • http://tasigezagu.scienceontheweb.net/astm_standards_for_textile_testing.pdf
    • http://kadanijojabuf.mywebcommunity.org/stephen_kings_it_full_cast.pdf
    • http://lirinevewafa.mypressonline.com/pdf_file_editor_app_download.pdf
    • http://operationhomeplate.com/iphone_notification_sounds_mp3_free_downloadr23hp.pdf
    • http://com-signto6.xyz/bomedamamitu8xnpk.pdf
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5ff2d26eba287.pdf
    • http://navalny.design/what_happens_at_the_end_of_you_should_have_lefthhhz6.pdf
    • http://brightshopbg.xyz/352074216951m10q.pdf
    • http://dusamoka.mywebcommunity.org/44805029595.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6027c8e566e6b.pdf
    • http://jushq.club/eyelash_extensions_training_houston_txcuedv.pdf
    • https://static.s123-cdn-static.com/uploads/4443810/normal_600388698b1f4.pdf
    • http://xesapuwax.mywebcommunity.org/95402501299.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pabotojixupi.atwebpages.com/99715221780.pdf
    • http://ginowane.onlinewebshop.net/bakery_business_plan_sample_philippines.pdf
    • https://uploads.strikinglycdn.com/files/b81cab93-0448-43f8-bea8-ed26daeea320/jinujujagozokuxuviriro.pdf
    • https://uploads.strikinglycdn.com/files/949ef44c-57f5-4fcb-b4af-0c0185840d82/do_androids_dream_of_electric_sheep_chapter_11_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42e.bin
5980ae0fcc2f25fd4474a73331db1c2f0fd943e4dde119078ab0720fd3301bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 5240 bytes
font_01_sfnt_off0000d5ff.bin
825a8b77f27ed1e9cf5dc74d524903330258394786564fa1d3cae6fa3b7aaed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 9920 bytes

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