Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18f33a0a8a8ba5e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 21:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 12b4494905240423fad0cbc924ee624e SHA-1: 1949a135865d6116e2a52039b87636f783a67583 SHA-256: a18f33a0a8a8ba5e78014b7b5514c097931cbb6d48f13c6f134825912c12885a
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by a high ML classifier score and ClamAV detection. The document contains a large number of external links, suggesting a link farm designed to host malicious content or redirect users. Crucially, it includes a 'Clipboard command execution lure', instructing users to copy and paste content into a shell, a common technique to download and execute further stages of malware. While no scripts were directly extracted, the presence of embedded URLs and the lure mechanism strongly suggest an intent to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://baarspo.ru/award?keyword=biosensors+types+and+applications+pdf PDF link annotation
    • http://usacarins.com/friction_review_worksheet_answers5vyl1.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/hdjahji/nobezi.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/zoxenebowagoporadupu.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/1fee330bcb5.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/lavujovogiruwip.pdfIn PDF document text
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/ridigokipow-muwuw.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/egchiij/horror_hospital_3_pc_game_free_download.pdfIn PDF document text
    • http://italywow.info/how_do_you_replace_a_whirlpool_water_filter6yszp.pdfIn PDF document text
    • http://healthytrands.com/revimovlmgz9.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/cAPyGpT/halloweentown_series_netflix.pdfIn PDF document text
    • http://insitemonitoring.com/mi_air_purifier_2s_manual6vcpd.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/hR4hhXI/hack_payrange_washing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/gfMgfhE/buvobalegujokerelisixusim.pdfIn PDF document text
    • http://gbo.guru/zoporaze2v7yq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba214a8a-0c8b-4433-b502-af94843c78ae/jamezirowegowufokagadijin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3ae7b1-46f7-4cbc-a6e8-605af167b254/peterbilt_diesel_technician_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379686c4-1175-43e3-8145-902a272aa1ac/how_do_you_light_a_gas_oven_pilot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a677ac90-b59a-40fd-81fc-40abc20c70ae/zumeseniragetevutox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151dca68-374b-4c86-b31d-9ca7ddece589/monthly_calendar_2015_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622b1f64-fcad-4de4-906b-d0825ea85716/defiant_motion_sensor_light_home_depot.pdfIn PDF document text
    • http://mitefunigesito.rf.gd/free_layer_slider_template.pdfIn PDF document text
    • http://fafamofuwinofen.epizy.com/number_flashcards_1-20_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0abddc-09fa-49d2-9357-bff423a82510/dapudulavagebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4881012-a9b1-45fb-8a43-3ad54fc7c3aa/how_to_say_manners_maketh_man_in_french.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_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 5300 bytes
SHA-256: dbdcabd9bab09e7d0c69283add949567ddd937d28682dc68db9b6301e5762fa6
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10368 bytes
SHA-256: 45567098a35053075b43212f68c335a2d17fc3a5ff823aadfd69ac7f1a676df9

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