Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6efb638bf0cdc5…

MALICIOUS

PDF

67.2 KB Created: 2021-03-22 17:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bf6b720c3dc32ba07c10b650a760ab0f SHA-1: 07db4bb82b930f6e475d6c3fb70c933971203460 SHA-256: 7a6efb638bf0cdc57f124075467aee35dc5f31db1dae15976581be5b5f50a8ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one pointing to 'jacksth.ru', suggesting a lure to a potentially malicious site. The PDF structure and embedded content are consistent with techniques used to disguise malicious intent.

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://jacksth.ru/123?utm_term=placenta+previa+rcog+patient+information PDF link annotation
    • http://kitafoged.medianewsonline.com/algebraic_expressions_and_identities_class_8.pdfIn PDF document text
    • http://firstdoctor.xyz/indo-european_etymological_dictionary_onlinenzk40.pdfIn PDF document text
    • http://fruitslope.online/bexezivireluzemira9ilvq.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/pixinegufimodati.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/36036940857.pdfIn PDF document text
    • http://habercigo.com/best_light_novel_reader_appiszef.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/d06561de-434d-4e6a-ac0d-7fc27382aed7/zecharia_sitchin_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171425d6-27cf-44d4-9ff6-4d42d8c369a6/mavefanumaranaburag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307150d3-01bc-447a-8176-8725d7362979/suwokozasulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb949e3c-a76b-4675-8869-d83b2e5b6ba1/lenovo_thinkpad_t430s_drivers_for_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ed67ec-2aaf-4c08-95bd-0980f3429822/nisubobubelefumat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49aabcb8-41a9-4444-8308-0e7d2543bf5d/hp_deskjet_f4280_driver_for_mac.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/ukulele_blues_tabs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e045b91-7e32-416d-a40f-66d9f4363345/how_can_i_make_money_online_in_cameroon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043cc375-c06e-4d34-aae8-5217edce0973/zuguwexadomalawonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ae6849-46f5-438b-b6ca-5a28d0a4555e/introduccion_programacion_neurolinguistica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a4ab7c-ac80-4df2-84f3-6e8dd41ea6da/accu_chek_performa_e7_error.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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 5216 bytes
SHA-256: 91208b1bca124de550a378dc602133e4aa22c7a16a1f197f1712f93c38d04df7
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 10040 bytes
SHA-256: baf83eb05165fc7ab1c6eb2405383b1d5594df411a8b60d820669d47aa382e7a

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