Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a09c0d1afc8e7f…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 01:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e60c237dea0d80f3b089df5f3c090b8 SHA-1: c591e40937f8538530233675a5ac6261e1b94bd5 SHA-256: d1a09c0d1afc8e7f43a0cfa9a1d5f87e4c115603fc62e14b95e20507d8f24029
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=how+long+does+it+take+to+count+to+10+000 PDF link annotation
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/df373ab98be8.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/4337692.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/2195989.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/780d785.pdfIn PDF document text
    • https://zameleto.weebly.com/uploads/1/3/4/0/134042643/7b4ee6718bd54e1.pdfIn PDF document text
    • http://puxumelopiw.22web.org/fedegezipekege.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/nilek.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/elite_fitness_inversion_table_it9310.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/all_derivative_and_integration_formula.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/biblicamente_que_es_orar_en_el_espritu.pdfIn PDF document text
    • https://lodovape.weebly.com/uploads/1/3/5/3/135350971/b2b72.pdfIn PDF document text
    • https://vuvumapidikam.weebly.com/uploads/1/3/4/6/134668868/sijivorumopofow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_22c992ff6a304ef092641651b04ba2cc.pdf?index=trueIn PDF document text
    • http://jilutuve.rf.gd/how_to_add_excel_table_to_google_docs.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_3029f1eba3b94b4f8a43ea5d0c5a5da8.pdf?index=trueIn PDF document text
    • http://watokugen.epizy.com/dagalaroxijekugawabafo.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_94754002da4846d78b36bb80a716c77c.pdf?index=trueIn PDF document text
    • http://viwajetomuzopo.epizy.com/functions_of_modal_auxiliary_verbs.pdfIn PDF document text
    • http://vuginok.epizy.com/verbal_ability_for_tcs.pdfIn PDF document text
    • http://xokeraje.rf.gd/xubufegojudapute.pdfIn PDF document text
    • http://galapeb.epizy.com/cantoral_catolico_con_acordes.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/wefiremifoza.pdfIn PDF document text
    • http://jizonizop.rf.gd/60552789789.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_ef05133999b34a20a34fab6b2c166b36.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_2dd6e4e8a00942cf8a3a6cd4371ea6ab.pdf?index=trueIn 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_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 5324 bytes
SHA-256: 5e04b9262e2d8ea3fb0c941f452a30cac7139b3441476914586c870e80fc9adc
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 11688 bytes
SHA-256: d254a2f3d13746e4c98b1cb308f38d3d0751611eeed737a453abd4691144f824