Malicious PDF — malware analysis report

Static analysis result for SHA-256 1442ecec04bd338e…

MALICIOUS

PDF

79.9 KB Created: 2021-04-14 05:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f5d6812e71de85c3e4731b82632eead2 SHA-1: 0ab404538466f7165ed046bdabde3261d02d84d0 SHA-256: 1442ecec04bd338ee62093d9b379fe61b7e40604c8007c3ac660239087c695a4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The PDF's structure and the presence of external URIs suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jumiwimov.ru/strik?utm_term=what+are+the+main+characteristics+of+food+chain+and+food+web PDF link annotation
    • https://cdn.sqhk.co/tirabipati/sbFqgeq/lolexererudebanomerana.pdfIn PDF document text
    • http://naturebiolog.space/computer_programming_notes_free_downloadyjb58.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/8q3Z3WE/super_stick_fight_warrior_duelist_survival_pack.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/33064751714.pdfIn PDF document text
    • http://b0xberry.online/puente_hacia_terabithia_netflixui0wx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fec4c861683f.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/giUgghf/online_marketing_certificate_programs_free.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/kojojonowole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5ff8910b4a8de.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/pimilibedugo.pdfIn PDF document text
    • http://dlkmvkoenv.info/70921480932n7tb3.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ahbigit/grow_zombies_hack_apk.pdfIn PDF document text
    • http://tranquils.space/bdd_excel_templateuv3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/gUhgRhb/tap_tap_builder_mod_apk_unlimited_ruby_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_6022caf2f3bc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_602d3ca2d6867.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2408405-efc5-468c-8b1b-b8069b2e46e4/a_single_man_tear.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/51251185688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aada0d9-66b7-48af-9df9-7775c6bc87bf/what_does_pist_stand_for.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/derechos_humanos_concepto_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/relegovoganabenam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c683686f-5bb4-4cc0-88be-6a4048c36c5e/how_to_find_estimated_delivery_time_usps.pdfIn PDF document text
    • http://marurutefa.atwebpages.com/xuretase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4355e0bd-6b70-4ce1-b89d-2f101ab14889/gukepuzowasesilano.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/does_alina_end_up_with_nikolai.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/city_of_calgary_recreation_programs_guide.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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 5476 bytes
SHA-256: 074bab486e05e054273d6847d6d183f07f6e8c7c160023d5d85cc9aedacca0eb
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 11340 bytes
SHA-256: c5e7ed404b406dbf1b33700c6f0807e22267f5b6ead25c397a55706522577de7