Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef19253575a5fa73…

MALICIOUS

PDF

77.0 KB Created: 2021-04-27 23:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 44f02ad96932caa4d41714e28bb6baf9 SHA-1: 78f2195623316e87adc8ff440628b544b0c0cdbc SHA-256: ef19253575a5fa733fe897b48eddabc9602a9056b2b16af4fb31d117b0c629dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in malicious PDFs to redirect users to malicious sites or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=does+walmart+have+portable+cd+players PDF link annotation
    • http://xorabawik.medianewsonline.com/al_quran_al_kareem_in_arabic.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/alpine_ine-w960_wiring_harness.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/baxunovogidubekigizo.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/100_item_answer_sheet.pdfIn PDF document text
    • http://idealicaitalia.website/295317927222leps.pdfIn PDF document text
    • http://oyuncuxx.com/fadefawikada9qo5.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/canucks_schedule_2020_20.pdfIn PDF document text
    • http://5coupon.info/pacific_fitness_zumaaqy4i.pdfIn PDF document text
    • http://azules.ru/78369407944n8p24.pdfIn PDF document text
    • http://fruittea.space/67060727153g9imu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowimifefezujo.myartsonline.com/38514106275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9d9caa-ad71-4b03-9a13-4b4f33b7687f/53563700645.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/verb_1_2_3_form_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70ac934-9fb7-4dc4-9fed-4753995503c1/who_is_john_maxwell_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72109ef2-6263-43f5-864b-9e5f321d84a2/mivakalujukenuvuzubumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0371f28-684a-45cd-9ce5-b9006a51b2f4/49794309771.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/21792873005.pdfIn PDF document text
    • http://kavezusi.onlinewebshop.net/94367693493.pdfIn PDF document text
    • http://xutenasejubibe.atwebpages.com/ap_transco_ae_notification_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c611354-bd86-41c0-9670-c2240ba29a43/75200841714.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5704 bytes
SHA-256: e56d09349103f78bd1b6811bc93aa483c1c9b1594647e1eeac365f354c75edfc
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 10652 bytes
SHA-256: 55a35185ae5fe81b384181f3fb24c66048139d816f025fafcb35d35630475357

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