Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f09a223c87abac…

MALICIOUS

PDF

75.2 KB Created: 2021-03-26 16:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 39a666f42427e485c4edf4494226c3a2 SHA-1: 73e20eeba857b847ec3a2f16ed03e80eb2d3cdf1 SHA-256: 92f09a223c87abac78c335c22796b49f6d56facea7edc75cd0cc42f11929e9f6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and redirectors, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism for malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=d%2526d+5ed+dungeon+master%2527s+guide+pdf PDF link annotation
    • http://womuvizitina.mywebcommunity.org/79985462019.pdfIn PDF document text
    • http://carishr.com/python_pandas_groupby_cheat_sheetcku35.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/iso_iec_27001_audit_checklist.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/a_cup_of_tea_katherine_mansfield_questions.pdfIn PDF document text
    • http://losqutoq.online/tipoguvinixomvfo3y.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/why_is_my_beats_microphone_not_working.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/quadratische_funktionen_lsen_aufgaben.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/tomb_of_annihilation_the_eye.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/rovapexixo.pdfIn PDF document text
    • http://form-copyrightservices.com/how_to_rig_a_fishing_pole_for_speckled_troutmkrlw.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/fotovolovo.pdfIn PDF document text
    • http://fadulifakibul.medianewsonline.com/azorin_obras.pdfIn PDF document text
    • http://smartcoin.design/bewejd0z84.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/les_panafricanistes.pdfIn PDF document text
    • http://tryse.xyz/bulleya_ringtone_zedgeos1za.pdfIn PDF document text
    • http://dkmz1.club/hp_elitebook_2740p_ram_specssap8q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/bowodotiwud.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_8aa05b7864ab4c8490ae5b39db5835c6.pdf?index=trueIn PDF document text
    • http://jonesojawu.myartsonline.com/civil_engineering_book_bangla.pdfIn PDF document text
    • http://nosawakudik.myartsonline.com/wipizeked.pdfIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_e7020dc2b54f456ba264d58ff236d2fe.pdf?index=trueIn 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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 4156 bytes
SHA-256: 9253c4ec90eb8b217ae91b3aef6412788d3d1419415539c5cfb70110cf842fd1
font_01_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 10836 bytes
SHA-256: a451c994a61edc6e47d2986b3765400240bd9cb18ff2441db33587f47dbbe93f

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