Malicious PDF — malware analysis report

Static analysis result for SHA-256 0663ddd6951d3e50…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 18:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4e8356bd51f116cb2800be5ba5573d0f SHA-1: 042e1f598962cddc3c92674ac81b36c4e465a530 SHA-256: 0663ddd6951d3e50a477a87e63b11e81bb9689dc30ba0aed52c85d9dcaaf5781
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable link farms pointing to external URLs. The ML classifier and ClamAV detection strongly suggest malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'identifying parts of a cell worksheet' to direct users to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jottigo.ru/wix?keyword=identifying+parts+of+a+cell+worksheet PDF link annotation
    • http://kedejivebirago.iblogger.org/bizirudutogozovivi.pdfIn PDF document text
    • https://popezerimev.weebly.com/uploads/1/3/4/5/134514232/xiwazebe.pdfIn PDF document text
    • http://praktika-ingenieur.com/what_is_meant_by_data_pointer10rb0.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/bufeg-duravivago.pdfIn PDF document text
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/dafutito-vijetufidamur.pdfIn PDF document text
    • http://nukicew.xyz/bojogajixexakonisimurusimdkoha.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/90854195781.pdfIn PDF document text
    • http://zujakupuk.22web.org/pemanorudiranewalaxusit.pdfIn PDF document text
    • http://mists.space/bodujimewikotusepomuj90uyu.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/c022c4.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/ielts_reading_2020_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobujubiga.epizy.com/dused.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/co-_operative_laws_questions_and_answers.pdfIn PDF document text
    • http://bemawom.rf.gd/korogex.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/best_motorcycle_battery_tender_charger.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/birds_images_with_names.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/64867214278.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/82205764066.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/52322955149.pdfIn PDF document text
    • http://kulekewu.rf.gd/meendum_amman_movie.pdfIn PDF document text
    • http://gefilodeza.myartsonline.com/kamyab_jawan_program_application_form.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/gotiwabisutafosafutozipa.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/fekivepifofunajalav.pdfIn PDF document text
    • http://vitusaw.rf.gd/49714355785.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/spreadsheet_application_for_mac_os.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_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5612 bytes
SHA-256: 112ffb5518b3ebc413bdf0fe8222ce8bdc1551e24ae7f1478e617c8052e3d0b2
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10644 bytes
SHA-256: a0b5daf812d1f9a078c9fcce6f13c5562d41c70e086d695296873c0cbee6fc2b

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