Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7a61cec239de99…

MALICIOUS

PDF

81.2 KB Created: 2021-05-13 18:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 9ebab4b44e77592f060288783a14e3d8 SHA-1: 918225f223df0a1c6f952405033046605c63e6cb SHA-256: 1f7a61cec239de998db8d2c05be3099b8fc063bfb677eb0265505255a5c466af
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, 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 numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dugedepap.ru/strik?utm_term=wheel+horse+rye+total+wine PDF link annotation
    • http://hookup753.fun/corporals_course_leadership_1_answerszj6xf.pdfIn PDF document text
    • http://zebrait.fun/mississippi_firearms_permit_renewal_form2av8z.pdfIn PDF document text
    • http://kzrovk.xyz/how_to_transfer_video_from_canon_gl2_to_computer1llds.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/ensayo_argumentativo_del_aborto_a_favor2oicj.pdfIn PDF document text
    • http://item-get.top/310303647161mssz.pdfIn PDF document text
    • http://leadtop.co/pixagegimiz47f1w.pdfIn PDF document text
    • http://prostochillforum.fun/943762223327pibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5ffb9671becf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458421/normal_601d1b52312fe.pdfIn PDF document text
    • http://lunesygets.xyz/desmos_quadratic_regression_calculatormgpcr.pdfIn PDF document text
    • http://migriruy.ru/echo_and_narcissus_clip_artcktuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5feda3fe458b2.pdfIn PDF document text
    • http://899themes-demo.ru/99508611838d7xxt.pdfIn PDF document text
    • http://creditstar-kabinet.com/fifofofupolevio1p39.pdfIn PDF document text
    • http://faceit.su/eureka_easy_clean_handheld_vacuum_manuall3z8e.pdfIn PDF document text
    • http://golden-bridge.pro/85295640717cm0l3.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/c583f096-33b0-4334-8df3-e47201ba1bf7/22078601499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3c745e-14e1-4ec0-9d14-2009b8fc7bed/interview_questions_and_answers_for_payroll_manager_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73ad07a-654f-438d-b83e-51bf2e5c2606/advanced_excel_course_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4a1b7c-10cf-4597-870c-465c2a31909c/mukafudomazipib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987bf80a-939d-4b7b-8cc9-8a8dfd13f1ca/letijufaborogoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854ac0ee-1516-4cc4-9c78-924e11cb25c6/strategies_to_teach_reading_to_students_with_dyslexia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25378f88-03b5-4d8b-92bf-f1219eae77e9/gizewawupubarubalik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c952b7-0425-4f0c-8202-afd825c45a90/xosasonutifikefilibuvudim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699eebc8-cd0a-48d1-8bd2-6283e59863c8/95703687558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f721598-e5c0-4bc7-b8fb-53b9f3ca10f6/christmas_family_feud_game_questions_and_answers.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_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 4980 bytes
SHA-256: 85fd778f6da642f6048aeaba18656ee1fb0e5f2989c94242c61f35e2f1889698
font_01_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 12412 bytes
SHA-256: e38511397ff534a80b2de4a532dd590f92ec70a6f96dda6f2e012356a08d4b7b