Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3715df486c4c3f…

MALICIOUS

PDF

78.3 KB Created: 2021-05-01 13:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e010b282be334dde650d2a26509acc4 SHA-1: 5948998ce19a15706fad25cf1e58089e924f8ba0 SHA-256: 5a3715df486c4c3f56a658a80a838721ebb99bf6ff6545a0877d286710c1bc3f
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://baarspo.ru/strik?utm_term=dark+souls+3+review+gamespot PDF link annotation
    • http://ericksandoval.com/apostrophe_practice_worksheets_with_answerstudfi.pdfIn PDF document text
    • http://cactusvpn.live/the_adventure_of_sharkboy_and_lavagirl_movies4dtn.pdfIn PDF document text
    • http://sell-toclick.online/71579119723h9uqm.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/homemade_chocolate_icing_recipe_with_powdered_sugarvwnz0.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/12331305767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_606e5252210b2.pdfIn PDF document text
    • http://1xbet-regi.site/nfl_personal_conduct_policy_suspensionsvs2jl.pdfIn PDF document text
    • http://matepiruzozu.iblogger.org/46205018732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_606be2b5c1331.pdfIn PDF document text
    • http://jumbochecker.com/adobe_premiere_pro_cc_2017_download_softonic8bbj9.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/jobezemapobaresuzuje.pdfIn PDF document text
    • http://babysampler.com/saxidupvb0we.pdfIn PDF document text
    • http://hookup756.fun/oxford_picture_dictionary_2nd_edition_free_downloadimo6f.pdfIn PDF document text
    • http://keepqifi.space/keystone_pipeline_oil_leak_in_north_dakotaspfq2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxebujo.epizy.com/present_simple_positive_negative_question_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a741aa94-22d1-4423-8df4-4199ba7e1f90/sixen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8608a1-732e-4c7f-a688-e45fc0bc73f9/transferencia_de_materia_y_energia_en_el_ecosistema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc765c44-8b96-49f5-acb8-00c281ff106a/biwabubalozopopisufazix.pdfIn PDF document text
    • http://magoguramu.rf.gd/90404375805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6091643-79a5-4f8c-a391-b7ffecd65886/rodufigag.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5516 bytes
SHA-256: 23565d7f0bcb8f37a05ed1e2dc48fe587b6b442b34cccc2762780938fe7aec1d
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 11252 bytes
SHA-256: 0bf21b7418e562d5585ec280faf9beeebf1813f7e9769903e9245893560e6025

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