Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f14c0d8b362a9…

MALICIOUS

PDF

72.8 KB Created: 2021-05-14 18:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 11431b842a55af08dbaf852417c6159f SHA-1: c61da2597a836fb06b2b11bfc57441569e5f9383 SHA-256: eb7f14c0d8b362a9897e0e783978e3b2f59e328990ffaa5596e34fc85837ad85
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 0.9998

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://xezojetit.ru/strik?utm_term=what+constitutes+safety+in+the+workplace PDF link annotation
    • https://cdn.sqhk.co/geroterunetu/ahadBRB/nuvuj.pdfIn PDF document text
    • http://wonnaturila.space/3032330541xol2i.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/id3hdg4/multi_puck_hockey_game.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/7232533721.pdfIn PDF document text
    • http://uabiomanix.xyz/apush_textbook_online90566.pdfIn PDF document text
    • http://get3creditscores.info/juvikudinomugev4bmdi.pdfIn PDF document text
    • http://topstop.site/how_to_check_google_doc_history_on_phonej4qzf.pdfIn PDF document text
    • http://interbank.link/wordpress_json_api_user_registrationbpj23.pdfIn PDF document text
    • http://qunit.space/bus_simulator_2012_trke_yamaxyaat.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/gejjQq4/stickman_warriors_my_craft_online_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_c626e2160f024dc186049462cbbd0780.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d70c5e-3eb0-44c6-be5e-1586772b261c/6801559783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804c4ac9-c37d-4811-b70d-fb482087ab18/jakesilug.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_56502eaa14564a6fab3272891d52b1b4.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_5f327cdd84524c84a8909fe482c7177d.pdf?index=trueIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_0d6dde9fe1cb40bdb8c91ee4f4a949e4.pdf?index=trueIn PDF document text
    • http://fabevax.myartsonline.com/agenda_diaria_2020_para_imprimir_gratis.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 5372 bytes
SHA-256: 28229a9510f07f18bb8df3413325a71f77952abb6dba238a0e5f05cdbb2c0368
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 9960 bytes
SHA-256: be57ea6509fd05280ae854dea4992b7eeff21a4bcb2ed93750191bfc0d79e2ac

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