Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5e437e97daeacf…

MALICIOUS

PDF

74.9 KB Created: 2021-04-12 01:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c21b6e8d02807246098730a5a1f934ea SHA-1: 5e4c12e322b874ca144bfd98299b2d7b44ffb062 SHA-256: ba5e437e97daeacf1adfc0c600a3c1a1b4b4fab8bc3d197672ae4dafa88e97c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=panasonic+dmr-ez48v+review PDF link annotation
    • http://baxijemapuzoxu.22web.org/vivorekapakadadalizu.pdfIn PDF document text
    • http://remipav.22web.org/doon_valley_app.pdfIn PDF document text
    • http://sq11mini.com/859508881013g3nf.pdfIn PDF document text
    • http://vorecan.fun/how_to_do_a_tankless_water_heater_flush2xhke.pdfIn PDF document text
    • http://presentinsta.online/gikizijudugikatetawerugukpz1g3.pdfIn PDF document text
    • http://summer-italy.fun/kolaxemalejaziboselijab8qaz.pdfIn PDF document text
    • http://lightly.store/96169787198a797e.pdfIn PDF document text
    • http://best-ital.fun/48968924084jblj5.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/departamento_de_educacion_estandares_y_expectativas_educacion_fisicay6j70.pdfIn PDF document text
    • http://zoomita.space/30393357060ipi5y.pdfIn PDF document text
    • http://lnstagramoriginal.com/business_office_manager_jobs_houston_txs4hew.pdfIn PDF document text
    • http://study-english-04.space/how_to_learn_anything_faster_bookew1c7.pdfIn PDF document text
    • http://amst-watch-v2.club/history_of_alcoholic_beverageseo80v.pdfIn PDF document text
    • http://upgrade4me.com/snack_video_download_without_watermark_mod_apk4331g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogexigup.rf.gd/34085211974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135c5221-d652-4e5d-8d8e-96254a6a350c/27804494455.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/kufuxexejadilasuwenekaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99b63ee-eff1-4117-9cb1-cb01b80a6a09/what_are_the_best_cardio_workouts_to_lose_weight.pdfIn PDF document text
    • http://netidufek.rf.gd/zedomogodafunarew.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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 5572 bytes
SHA-256: 197b0db4183e98e2d6dde1b0cbe2518a4273c53e192286ba98a9d6b908cc0a9a
font_01_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 10688 bytes
SHA-256: 47ea622976ae34688500fb4dc7058b3ff391a5475fcf3c036429c056849b1ce4

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