Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd4ebe83e1f053…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 17:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c100e770ecf1afe361e35739532a4f SHA-1: 9c27efe99a5a5b0d8540195d211f65203ab2ec1c SHA-256: 8bbd4ebe83e1f053a6ddef830e03422fa5d701c7b85ceba7eb9f92f9d15f2df0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

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://zajinet.ru/strik?utm_term=samsung+p2770hd+remote+code
    • http://vas-rem.ru/what_are_5_characteristics_that_all_living_things_sharee0wfz.pdf
    • http://vamolufu.getenjoyment.net/exercices_corrigs_sur_amplificateur_oprationnel.pdf
    • http://kitafoged.medianewsonline.com/kodav.pdf
    • http://blankid.ru/how_to_write_a_case_report7pc4n.pdf
    • https://cdn.sqhk.co/remowiwa/Ujfhht4/tie_dye_kit_near_me_target.pdf
    • https://cdn-cms.f-static.net/uploads/4369499/normal_602922760ae7a.pdf
    • http://loxiturizule.sportsontheweb.net/7215209445.pdf
    • https://cdn.sqhk.co/rebosuvut/oygeRjg/alien_shooter_2_conscription_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4470524/normal_602ea714d6c01.pdf
    • http://micrometer25bill.site/thomas_calculus_12th_edition_trkeg88j2.pdf
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/3cd720aae6a6e.pdf
    • http://familyit.info/john_deere_lx176_hood_usedef3c3.pdf
    • https://navubuxodogonid.weebly.com/uploads/1/3/5/3/135327143/tulitotakevanunan.pdf
    • https://cdn.sqhk.co/vefuwebilux/jent4LX/doing_one_good_turn_a_day.pdf
    • http://copyright-helps-team.com/antrenmanlarla_geometri_2_zmlerie49o8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb0e865d-ddb6-4428-83f0-30c66a4df1ce/60724122412.pdf
    • https://uploads.strikinglycdn.com/files/7a17109c-686d-4e4c-a397-2f88551afb52/data_analytics_for_beginners_amazon-kinesis-data-analytics-java-examples.pdf
    • http://zugepoguj.onlinewebshop.net/54947637716.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f4.bin
86d066bb39613b6425550d0ce01221e51c5b40d7e2d624ef5a1e01ba9bf3f63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 5912 bytes
font_01_sfnt_off00010af4.bin
f5f5ecb8c4c450b4a99a423b85d1216ad364414ba668f3102acec355acfa99a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 11452 bytes

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