Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e8e64224a8fd6f…

MALICIOUS

PDF

87.5 KB Created: 2021-03-14 17:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe3d058fe13be2297cd58940fe92bdb SHA-1: 81239e8a7563cf6d958656f0c95a508075982a7c SHA-256: 99e8e64224a8fd6f6efb0d7ceb9a6d8ca99bb1ddb9494d8a7d266f59280d262f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/123?utm_term=abortion+law+reform+nz+bill
    • http://nibewubixela.getenjoyment.net/nanebimaxow.pdf
    • http://retapadu.medianewsonline.com/is_jump_force_on_xbox_one.pdf
    • http://saxosoxajivovud.medianewsonline.com/kibonosa.pdf
    • http://sudidukof.22web.org/please_see_below_information_for_your_reference.pdf
    • http://leduxebawini.22web.org/bollywood_video_songs_free_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_8fe838d74fdc49b8b15f65bd902a7bf2.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_9f597fc480564999a0a29324ac95ea5c.pdf?index=true
    • http://karifopiti.epizy.com/windows_10_mobile_icon_pack_for_android.pdf
    • http://vetanafajodomek.epizy.com/solution_set_calculator_with_steps.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_e97d375e1ac6480d8360348328e24f36.pdf?index=true
    • http://dixuzudes.epizy.com/euro_bus_game_for_pc.pdf
    • http://fasujenijasezos.rf.gd/how_do_i_get_my_brother_printer_out_of_error_state.pdf
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_7916b2a1095e408c88174847137e4a40.pdf?index=true
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_876155f0e09448ba81a9f66af331d3a5.pdf?index=true
    • http://fezovinu.epizy.com/novuwegofo.pdf
    • http://dobifagamuwu.rf.gd/vakegorokix.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_13be5e52a4a4472dacd2edc60471447e.pdf?index=true
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_a2f56911eef94e3aa369872ebbb2692b.pdf?index=true
    • 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_off00011ac6.bin
961cf900a889681de1169379bd76c3e81d172d0f43e130859c1d66268ef40992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 5008 bytes
font_01_sfnt_off00012bd5.bin
2195329418d83281e8fda4da76c042388ff1d0ef24c83c72890600babc7bd516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 10820 bytes

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