Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86ef23ee82b2a12…

MALICIOUS

PDF

95.3 KB Created: 2021-05-05 19:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fbebf799c9f2d6e3b12c7c13efab5fa6 SHA-1: 509eae54e3b42998704da92c1e6f0a594cf37a39 SHA-256: d86ef23ee82b2a122ce1804d8d41b5b45f04babebd315ea821c242f434d1fe5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=hist%25C3%25B3ria+geral+do+brasil+maria+yedda+linhares+pdf+download PDF link annotation
    • http://winemewimivo.22web.org/pdf_file_size_compressor_online_free.pdfIn PDF document text
    • http://fejofezipekow.iblogger.org/89457451228.pdfIn PDF document text
    • http://selectgetc.top/nojizidusuvz8i6o.pdfIn PDF document text
    • http://blaugrana.ru/zosibubupivakimanolj4fwh.pdfIn PDF document text
    • http://vezerfa.xyz/73501318239dqdt7.pdfIn PDF document text
    • http://pitokukepabije.iblogger.org/barron_s_new_sat_math.pdfIn PDF document text
    • http://mini-camera-super.club/98271682393ttxko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedezanopade.epizy.com/how_to_write_a_motivational_speech_for_employees.pdfIn PDF document text
    • http://tifafepomuko.epizy.com/fisipoteluvagerofaserazes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d8d336-33ef-4674-97e5-a9f39750d125/bujesezojojovesipim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195dbee0-fec8-4a9f-ac01-0b144b39270d/yamaha_mgp32x_manual.pdfIn PDF document text
    • http://gugonit.epizy.com/how_to_check_the_better_business_bureau.pdfIn PDF document text
    • http://xinirujoki.epizy.com/medical_short_cases_for_medical_students.pdfIn PDF document text
    • http://xutarefes.epizy.com/al-anon_12_step_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba9192b-cd0a-433a-8eb7-bf8f72a90e2f/zitoxitodalesapekawari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a54ca5-ea77-43b9-a117-f0cc3fafd460/forerunner_405cx_battery_replacement.pdfIn PDF document text
    • http://vuruxujiga.rf.gd/ocr_arabic_to_word_online.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/atbu_postgraduate_admission_form_2019.pdfIn PDF document text
    • http://poniweja.rf.gd/investor_pitch_presentation.pdfIn PDF document text
    • http://javuturevof.rf.gd/zelawum.pdfIn PDF document text
    • http://remigesej.epizy.com/nibemelefuluxesamofap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344351ba-355c-4867-bca1-6201ee84954d/health_psychology_special_topics.pdfIn PDF document text
    • http://dujepuxa.rf.gd/wolis.pdfIn PDF document text
    • http://pepezuvizomu.rf.gd/nicomachean_ethics_book_1.pdfIn PDF document text
    • http://kegipufi.rf.gd/jedikomonoseduxij.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_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 5888 bytes
SHA-256: 3422b52c3e3056f9c58fd95e69646853a268d7db8b513f744452513ce8ae1650
font_01_sfnt_off00014124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14124 14916 bytes
SHA-256: 4c9bc02eeb52f3dd774cc94a54ecac9bd564c6bb6525dd89a9488b00b1a02e6e

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