Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd870fa112495e7…

MALICIOUS

PDF

86.3 KB Created: 2021-04-10 07:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9677aa27b04741688928c1f47962c79e SHA-1: e220fbe61348e99d8d568ec5f8594a5d6b7d55f8 SHA-256: bdd870fa112495e7b1371f96a8c429e105e31dcf615fe510a445c4a956285fe8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=so%25E1%25BA%25A1n+b%25C3%25A0i+truy%25E1%25BB%2587n+ki%25E1%25BB%2581u+c%25E1%25BB%25A7a+nguy%25E1%25BB%2585n+du+9 PDF link annotation
    • http://bonugonir.22web.org/sudutadid.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/biological_effective_dose.pdfIn PDF document text
    • http://doridusa.medianewsonline.com/87194569033.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/86382466885.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/paletowiv.pdfIn PDF document text
    • https://doxuxipineza.weebly.com/uploads/1/3/0/7/130740192/895da962e86e2f.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/topikezuk_gajepolar_kojiwidekajozas_jipipo.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/tozobol.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/alimentacion_complementaria_minsa.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/f03a85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_51731f96488a4e4684f6b896894b010e.pdf?index=trueIn PDF document text
    • http://wixinufez.rf.gd/yamasa_slot_machine_parts.pdfIn PDF document text
    • http://mitegoma.rf.gd/71183318081.pdfIn PDF document text
    • http://komoxam.rf.gd/genetic_polymorphism.pdfIn PDF document text
    • http://rigozapovi.epizy.com/37064821774.pdfIn PDF document text
    • http://samipada.epizy.com/non_governmental_organisations.pdfIn PDF document text
    • http://kilobawul.rf.gd/jawefusaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbbdecf-db58-48ef-9723-dec54e6c7790/sufadutudeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dde7b0-1a67-46b8-a46b-c148b11c98c1/pdf_to_html_converter_php_github.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_fb44e7cb0b3d4ad1aa691f692cffb8d6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 3108 bytes
SHA-256: 9f0dc06ffc664f196562f4f4bd32e04ab8adf5ef23e1bfac687577c5d06164ee
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 6672 bytes
SHA-256: ed164a1a7fde22ae7d756e912bb9d03753d388d20a50619779f38a50f3b2a7ee
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 24492 bytes
SHA-256: 8e6998c4dfa9e5f4046b1535c77bb52ff662af3e8a625e6f3434cc33b32f38a3

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