Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba1f3b3a32eaf0a…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 15:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 79231546f7b4c7924e24e0bec176b609 SHA-1: df90c51fc9f96cf3e15be93d198063fda3d20c8c SHA-256: dba1f3b3a32eaf0af6a7e8727dcf8f9a95919921211890ae4dfa29728242ef70
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

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://fokemale.ru/wix?keyword=homologous+structures+coloring+worksheet PDF link annotation
    • http://grafoanaliz.ru/281788000818hd2o.pdfIn PDF document text
    • http://megidexabaror.mywebcommunity.org/statistics_machine_learning_python.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/final_event_in_men_s_decathlonkuhed.pdfIn PDF document text
    • http://mazonenebu.22web.org/jesil.pdfIn PDF document text
    • http://namedaun.fun/42004486530s75sg.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/xiziv.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/hoover_windtunnel_rewind_hepa_filter.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/jivotosibigob.pdfIn PDF document text
    • http://paksorond.xyz/fire_emblem_three_houses_mercedesgbdq0.pdfIn PDF document text
    • http://masito.space/elite_dangerous_horizons_keyboard_lapssao.pdfIn PDF document text
    • http://womenit.space/tomando_el_pelo_en_espanols5fv1.pdfIn PDF document text
    • http://online-sistem.site/separator_sheet_workers_compensation_documentk6plo.pdfIn PDF document text
    • http://kamini33.ru/gebigozaxunifivurn1jk.pdfIn PDF document text
    • http://vnds-super.space/twilight_saga_collection_booksj0t60.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/1851efd2-b0ec-4b26-a806-45e2dd3bd916/netgear_n300_dgn2200m_v2_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb30db23-8554-4f96-832f-3435a5d3e9c0/54052014034.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_f4b4ce5ee15d4782a11ecefa4adc785b.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_cc63d2bb84b24c8b8b781d2bfb13a75d.pdf?index=trueIn PDF document text
    • http://wifofaxip.epizy.com/fujosoxex.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_f019b37132cd492ca6d9187d8c8d0102.pdf?index=trueIn PDF document text
    • http://wiwilewito.epizy.com/my_side_of_the_mountain_song.pdfIn PDF document text
    • http://lurozakilaxa.rf.gd/34242269232.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/2010_chrysler_town_and_country_3.8_engine_oil_capacity.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_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5120 bytes
SHA-256: aefd12040dcc7726551e638a7744ca11bec93a43bc6cb7dc39533a7ece0a55c9
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10456 bytes
SHA-256: 31b79a5ed4b6023df618549e01fb4e02d1f42c79aedc80bc58d905fd3cc8ee71

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