Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ace66a6a27f43b…

MALICIOUS

PDF

84.6 KB Created: 2021-03-05 22:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7f66b13993c0a136ae3207acc4709931 SHA-1: 0b03a560975209aaa1588c15818d63eccedffb20 SHA-256: c2ace66a6a27f43bc818e2840a207d9e4aa3b3be9826573e5f9e6de9212fd180
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to obscure malicious destinations. The primary malicious URL identified is 'https://baarspo.ru/strik?utm_term=clave+unica+de+registro+civil', which is likely used to redirect users to a malicious payload or phishing page. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=clave+unica+de+registro+civil PDF link annotation
    • http://idealsit.space/division_problem_worksheets_3rd_graded7a7g.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/bose_awrcc1_review.pdfIn PDF document text
    • http://vzroslyh.net/874914883kc94q.pdfIn PDF document text
    • http://betixisu.22web.org/2495012531.pdfIn PDF document text
    • http://sumazubaviloxog.22web.org/zuzosanelugagudemolovujon.pdfIn PDF document text
    • http://andyhong.blog/mananogh4kkx.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/32912093144.pdfIn PDF document text
    • http://gratoramaa.website/father_son_ping_pong_trick_shots_2fg4vk.pdfIn PDF document text
    • http://trudogoliya.online/93637320960vf6tt.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/52e0d004-bc9b-4e1b-acc9-337deeede63c/data_warehousing_concepts_techniques_products_and_applications_by_c.s.r._prabhu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d50e42-3905-407f-9018-d6390425d99e/bamijuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a971400-1a4d-4243-84b3-86e8b5f086c8/3418061522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf6ac89-0957-4b8d-9ca5-493643810a15/how_can_i_heal_my_plantar_fasciitis.pdfIn PDF document text
    • http://tilulopitajoma.rf.gd/bumuluwoseworulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4340a843-c208-4564-92d3-2d5a4867f07d/2018_forester_xt_reliability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef90ca3-d9ad-468b-937e-ab201a111014/dieta_fodmap_lista_de_alimentos.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_f58ae353de6c4279848f5c27a130b0ae.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_06f9521ee3884cd2840d64aa5a13e856.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f3081f8-329c-4cff-9fd3-d470584c07da/what_is_the_best_way_to_teach_a_child_with_dyslexia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6100e2b-70c4-4dfa-94ac-6822c3e0602d/pays_basque_francais_et_espagnol_carte.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_291deaacb75342b08f6b5584fa434229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5322a25c-3631-4d69-9b2f-07908a09587f/65124689659.pdfIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_0806788d86c347fc86cb721ecfbc4aa3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c708fe51-0c00-4b1d-9a06-eb20565415a0/93966054569.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/nepugakexemumexutivu.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_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 5072 bytes
SHA-256: bd03d90aabae3d97676adddf9806e9fd53e2100c2ea918deec0961bd24c9bf6c
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 11768 bytes
SHA-256: acb8e43d030e033636a11ee420681d8013a68df66cc8f7038b0b7e9571dd362c
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e