Malicious PDF — malware analysis report

Static analysis result for SHA-256 1766a77381aa0702…

MALICIOUS

PDF

84.9 KB Created: 2021-03-20 20:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d789c2145bd41cb0043800556326e77 SHA-1: 7e53194b71bc370fc52b92e574cd25c5e89932b7 SHA-256: 1766a77381aa0702453dba426d92b72735e446c4d4c4dd017fd00d4085c99f20
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, directing users to external URLs. One such URL, https://kuzutuzo.ru/wix?keyword=scott+foresman+reading+street+4th+grade, is identified as a potential phishing or malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=scott+foresman+reading+street+4th+grade
    • http://trysalon.xyz/android_ndk_c_17dhcf1.pdf
    • http://quickstore.pro/theoretical_framework_definition_in_tagaloggtium.pdf
    • http://salonhq.xyz/678494443592ytyg.pdf
    • http://online-bestshop.xyz/isuzu_rodeo_owners_manualnoarq.pdf
    • http://lixebafevoku.mypressonline.com/94360704417.pdf
    • http://larebalin.mypressonline.com/foleluzelekukuta.pdf
    • http://znohist.site/40773490438j2fck.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1273c40-e33c-40ca-a87c-67dd2e6cc151/10498897304.pdf
    • https://uploads.strikinglycdn.com/files/827660f8-8755-4747-b441-b4249bfc8fda/american_sayings_origins.pdf
    • https://uploads.strikinglycdn.com/files/6938382f-d495-4ff2-83ef-583443908ad4/a_que_equivale_kilogramo_por_metro_sobre_segundo_cuadrado.pdf
    • https://s3.amazonaws.com/pulavokaxe/button_form_bootstrap_example.pdf
    • https://uploads.strikinglycdn.com/files/1ed72e50-67db-4eb2-ab4c-ad66bd191f90/wujozezagutulazilug.pdf
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_faa541b23fb44d1d9eadf83c435462c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f88733d-ba5b-4639-81ab-e5a4477bd68d/clasificacin_y_caractersticas_de_las_cuentas_de_balance.pdf
    • https://s3.amazonaws.com/doxifuba/you_are_my_world_quotes_for_her.pdf
    • http://rizivubonulej.atwebpages.com/jigobifedapafa.pdf
    • https://s3.amazonaws.com/regovadeje/the_secret_life_of_walter_mitty_soundtrack_song_list.pdf
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_a2a4e30cac9340449700deba95183cde.pdf?index=true
    • https://uploads.strikinglycdn.com/files/788a4361-df7f-444d-9e13-d513aa839d93/sifemupajofi.pdf
    • http://benamow.myartsonline.com/helen_keller_summary.pdf
    • https://uploads.strikinglycdn.com/files/78288181-f307-4a67-9900-ef9baa39ed40/92637509075.pdf
    • https://uploads.strikinglycdn.com/files/c962baf6-4ff2-417b-9148-1c871e48a807/longman_dictionary_of_contemporary_english_apk_crack.pdf
    • https://uploads.strikinglycdn.com/files/01f7fee8-8271-4c3e-b073-f7c529b1f855/god_chasers_in_the_bible.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_df8c0a5b7cdd4b0482b9f1e4131756bb.pdf?index=true
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_5b5371ba3c71401287eeb3167f7c18b1.pdf?index=true
    • https://s3.amazonaws.com/fajetufekejo/maiden_voyage_jewelry_instagram.pdf
    • https://uploads.strikinglycdn.com/files/fe26959c-aa65-469f-9666-5e28abbed54f/32937457894.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_26032872f1ce4ab1a37ee0df3979b42d.pdf?index=true
    • 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_off00010a67.bin
08e2954f8f5541b125f8ae7ed4abdc429b8ec688f18447e056ea9c2c2d270666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 5596 bytes
font_01_sfnt_off00011d50.bin
a753f294fd127a67029efb3b9034cd57771a726eb5f49ff7e10a651207a8738f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 11948 bytes

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