Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c943e19592b5ab…

MALICIOUS

PDF

81.0 KB Created: 2021-03-20 02:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 944cb0de236a998b5d07d1e2e0aab9c6 SHA-1: 5780efb631523f26754f84349b33cfa915366cef SHA-256: e4c943e19592b5abce40c5b2bcfa0248703e76e6409f937cf5e739e63eebeb29
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/123?utm_term=sound+booster+free++for+pc PDF link annotation
    • http://raponikidosal.getenjoyment.net/nerazubixexagorasojoledu.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/el_interes_superior_del_nio.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/how_to_use_scroll_lock_without_key.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/46807090453.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/programming_in_ansi_c_ramkumar.pdfIn PDF document text
    • http://xitimudajejo.mywebcommunity.org/ruzasowege.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/bact_alert_3d_60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a264fd5b-8640-4d63-8b0d-197d236e7910/fokinoperivirururabud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e98b5c-2b6d-45f9-9417-27ef32b16b84/17641111915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77fea068-5369-4ed1-8eeb-b1cfb6ea91e3/formato_apa_2019_numero_de_pagina.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_fa7e54db0db8472382ff0889ac46bd5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbc488f-6765-4101-b113-24fc52d239bd/the_birds_and_the_bees_movie_2009.pdfIn PDF document text
    • http://naburonip.myartsonline.com/dapaxekeguwijesutiriru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe46e0c2-aa7f-4ff0-a62e-f4a721c871f3/what_are_the_advantages_and_disadvantages_of_a_database_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebba19f8-7a10-46d2-b530-15c637f0d8ce/zoruwigapaxepexerewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dfc2d8-6bf0-42ac-b622-14e7e3ad9bd2/84895457034.pdfIn PDF document text
    • http://luzojora.atwebpages.com/jpg_to_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a373a5e-cb9f-41f4-9b7e-a38932c07465/my_ps3_slim_wont_eject_discs.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_598d4d73e1f54b3e8abfd6ab9d57db89.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_46524746e9974ae4a63936b242641b9e.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_f59182be45af44549136fc06afb885bc.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_6baa2afdc8a94a6ca0a199cbf98a0dd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea7ce89-1b88-4e6c-9bfa-fc804a7c07ba/lexus_es_350_f_sport_used_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 4984 bytes
SHA-256: 0177a5026b2cdb3716599e1231d34fea2cd0ed678392f0681e2ef3200ac1f8cd
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10220 bytes
SHA-256: eb9a2c305c6976e91d171e49d79df11886f4622cd64de7fb13704a8707ae887b
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361