Malicious PDF — malware analysis report

Static analysis result for SHA-256 086b4b0a3c02ac9d…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 17:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f89327ba1d54d0382bdec86be9d3d361 SHA-1: d9a46ac3208184255f527a914b50d860b6c45950 SHA-256: 086b4b0a3c02ac9dfe507bbb73aa6633a004cfe12c826dc6ca97bbfd1371da6f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of 'cmd_commands_windows_7_hacking' in the document text further supports the exploitation of vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/strik?utm_term=practice+worksheet+quadratic+inequalities+answer+key PDF link annotation
    • http://kneeksi.ru/pregnancy_gifts_for_first_time_moms_singapore8eu94.pdfIn PDF document text
    • http://technodom11.com/marine_fish_equipment_uk063m1.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/too_lazy_or_too_lazy.pdfIn PDF document text
    • http://reduslim-eu.site/90869628251cxzk3.pdfIn PDF document text
    • http://ruwakus.22web.org/skills_practice_complex_numbers_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_601f7e02a8cfa.pdfIn PDF document text
    • http://am-sound.ru/884150091746sah0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_6033144324fbf.pdfIn PDF document text
    • http://regsenatvumen.website/jpg_to_online_merger1jq3h.pdfIn PDF document text
    • http://livecopyrightverification.com/zudavapabe3bi30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_602eb34649179.pdfIn PDF document text
    • http://avit0.pro/cmd_commands_windows_7_hacking_downloadqrnic.pdfIn PDF document text
    • http://blockhcain.host/hallelujah_sheet_music_piano_and_vocbt3ci.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/93250149255.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fede8e5106b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokipobobanokab.rf.gd/andaman_tour_guide_quora.pdfIn PDF document text
    • http://gumusijejokezit.epizy.com/instagram_profile_picture_circle_template.pdfIn PDF document text
    • http://livirava.atwebpages.com/84709455435.pdfIn PDF document text
    • http://pexoroxijaseduj.rf.gd/windows_10_update_assistant_tool_free.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 5412 bytes
SHA-256: 4a7b32449c285784147646a8626ce85ebf7cb0526eaaa9ac1ffc5f5329bded61
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10692 bytes
SHA-256: b923862041c875b9660c76ae3f24fa63638b35a4f715549f399c7f5d75bde2e7

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