Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae08da78cf948337…

MALICIOUS

PDF

78.9 KB Created: 2021-04-05 12:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a6802ae8d5491e53837fb04d24a455c0 SHA-1: 5903ecbcabe14f8471e50957b166321af5dc455b SHA-256: ae08da78cf948337cf2a2ac5a6795113992c7e383bdf1e49929f4f257da07b22
136 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and the heuristic firing for 'LOLBin token sequence in document text' suggest the document is designed to trick users into downloading further malicious content, likely by masquerading as a legitimate file like a worksheet. The embedded URLs point to potential second-stage payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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/wix?keyword=parallel+structure+exercise+1+worksheet+answers+pdf PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/catalogo_mary_kay_junio_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/ieLBiaa/rofimixuxabije.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/9jgijib/93524135343.pdfIn PDF document text
    • http://mezeferatitora.scienceontheweb.net/zoxebejiripi.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/cgfjdLD/50.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/muwavanum.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/49949576336.pdfIn PDF document text
    • https://s3.amazonaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fcb22a-e71f-4de9-a6d1-fa21eef79bbe/pizilebumuzepusomod.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/33652192249.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/building_houses_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/araldite_2015-_1_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/92710815229.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/highlights_hidden_pictures_answers_august_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/windows_10_powershell_startup_script_not_running.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/apa_style_manual_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d760f58b-ce23-4b51-b7ef-c7f984bcfde3/robilivafafamomulonulunet.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/wajibile/job_application_cover_letter_format_samples.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/campionato_serie_a_calendario_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/xupuwagijaledodiwejo.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/antiarrhythmic_drug_classification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1774e39-2539-457f-8be9-26f8ef5a5684/30387430765.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/64219530888.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/buwepuju.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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5520 bytes
SHA-256: cb733bd5624114ce2a991aae8de67da56d857000df9b3df2e4b0214b321fc2e9
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 11876 bytes
SHA-256: 81ad850131ba01cdb702faf7d813633471abc7c4fe73dd75204c1ac7f1f48de0

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