Malicious PDF — malware analysis report

Static analysis result for SHA-256 439d3bc431db18d6…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 01:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 38be43b655c7ff45193b2567f4ffda0d SHA-1: f61f265d35e17e04102a36c02fbfe5d86106fecd SHA-256: 439d3bc431db18d6d132eb865de20bbf9595d3398d2c28ea486b8dc8f0f0b8b9
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, with one pointing to a suspicious domain 'botokaw.ru' that is likely used for malicious redirection or phishing. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving password-protected archives, a common tactic to bypass security gateways. No scripts were extracted, but the PDF structure and embedded URIs indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/award?keyword=pill+camera+ppt+pdf PDF link annotation
    • http://hydrofthol.space/how_to_reset_q-see_dvr_password55axt.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/how_do_i_report_my_ebt_card_lost_in_nc.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/how_to_breed_dapple_dachshunds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fe8b5e2bc140.pdfIn PDF document text
    • http://cherrypimp.online/functional_programming_in_java_pierresonj.pdfIn PDF document text
    • http://teplotronic.ru/how_to_use_keurig_k_elite_iced_coffeene140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5fd7a4757f7bb.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/prayer_rain_dr_olukoya.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/2890e158-6ddb-4d6e-8aa3-cc21b68add81/90425674372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e83b786-536b-48af-8386-64476586344a/40729468916.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/manual_de_organizacion_de_escuelas_secundarias_tecnicas_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54c49da-80c7-4812-993c-fd6dbce15efb/bergey_gram_negative_flowchart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4948f8d-90ce-4e7d-848f-0484e7f7d34a/24061670804.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/50276858761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5bfe02-706e-49eb-ae9f-5f299d58d49a/whats_fords_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae3fec2-ddff-44b6-b6d0-fb8805ff7a4c/kagan_teaching_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/bajofiniwoman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1962a8d-b6a0-4ca3-bcce-b9fd40578bd4/how_much_does_pacsun_pay_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa95d7d-3246-4934-9eeb-16d8cf02ff96/36540843809.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_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 4696 bytes
SHA-256: a092b973a0969f69ebbf90d0edda5688997b6a4d0a1ffce9b6f2e8f7a5b52fb6
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 11088 bytes
SHA-256: 7bda10f97ac0f085385cbc1f3290ca6c058721635b3c79a5c5e5216e29493c60
font_02_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361