Malicious PDF — malware analysis report

Static analysis result for SHA-256 406d41dbc50fc0e1…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 10:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbbfaf7c64d435eaf5a8a1bc455cafbb SHA-1: 9cff5c12f55710df12d9525c4ed6e7d05e96a890 SHA-256: 406d41dbc50fc0e1fe0977618c94f694b56a0373cc3d72cd0af602c3115084c0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code or redirect the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/123?utm_term=ada+accessibility+guidelines+pdf
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdf
    • https://static.s123-cdn-static.com/uploads/4490141/normal_600061b85b985.pdf
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5fe189c1c2fb9.pdf
    • http://finoginujowiwi.mypressonline.com/90032120536.pdf
    • http://winoxolupuvil.getenjoyment.net/nozimabakegunugase.pdf
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5fdd8ed41ed42.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_601a28411659c.pdf
    • https://cdn-cms.f-static.net/uploads/4424647/normal_603aa75b80c32.pdf
    • http://desokore.medianewsonline.com/conhecendo_o_espiritismo_adenauer_novaes.pdf
    • http://fumexijana.getenjoyment.net/modixutazesedupegibop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xoxigibutu.epizy.com/pojelipogiborogitujuna.pdf
    • http://jojerigexorow.epizy.com/rahul_bhai_name_ringtone.pdf
    • http://wutejaxevewef.myartsonline.com/ronojimerulon.pdf
    • https://uploads.strikinglycdn.com/files/17f8eb09-0381-4385-84ee-b8a3da6a06df/beats_by_dr_dre_solo_3_price.pdf
    • https://uploads.strikinglycdn.com/files/6640498e-661d-48e2-9c09-4aab42a2e363/football_playbook_powerpoint_template_free.pdf
    • http://jebufipip.epizy.com/color_of_the_wind_piano_sheet.pdf
    • https://uploads.strikinglycdn.com/files/90a54176-415c-4b6d-9f53-2af8fbac1449/what_is_similar_to_wii.pdf
    • http://menimilerawapo.rf.gd/girlfriends_guide_to_divorce_season_4_imdb.pdf
    • https://uploads.strikinglycdn.com/files/841d4674-867b-43a1-9130-b16edab381ed/how_deep_is_town_lake_in_austin_tx.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_9a0a1dc12bb14a9784136ddae8bd15d4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6c5e746-7da2-4fca-9a90-ec8ed94ef691/simple_price_comparison_spreadsheet.pdf
    • http://wojibejo.epizy.com/24574159642.pdf
    • http://pixoralozod.epizy.com/woodcock_anarchism.pdf
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_438ed8a108914356a3d364b6e938f104.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_off0000eb9e.bin
07820cf9c8778b419fa43f07790c84f414e3ea71397b420f7fa04becbbc446a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 5460 bytes
font_01_sfnt_off0000fe4f.bin
660005620e70d769e8d2e8d2d7fdcdebd488c0604d222c798e531ab5f4fe9d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 11156 bytes

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