Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff442278fb0416d…

MALICIOUS

PDF

75.0 KB Created: 2021-04-03 09:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1261db40b945d4dc0b965175c9ccac37 SHA-1: fc0e5cd31a1a041d5d46c44b3df52e83274585b9 SHA-256: bff442278fb0416d6938859a5fa8c300ffe760293478695b7d1dd99eacd7674c
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+open+key+fob+for+lexus PDF link annotation
    • http://kakolamilasaru.medianewsonline.com/39492492084.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/tulekobezisowalenumaf.pdfIn PDF document text
    • http://givimemaregudum.sportsontheweb.net/band_9_ielts_writing.pdfIn PDF document text
    • http://judijemavup.22web.org/7087732535.pdfIn PDF document text
    • http://gavixed.iblogger.org/antrenmanlarla_geometri_1_zmleri.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/samsung_note_3_launch_date_in_india.pdfIn PDF document text
    • http://merutakozuxonu.22web.org/percy_jackson_and_the_sea_of_monsters_full_movie_youtube.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/3b81b38e-9525-4b62-a5d3-dbc4fb3ab783/ejemplos_de_oraciones_con_verbos_irregulares_en_ingles.pdfIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_8a5ed9bd42464fc1a4b905a94f89d055.pdf?index=trueIn PDF document text
    • http://ferodibev.onlinewebshop.net/pdf_antropologia_filosofica.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_8057c2f34c834843bcf6c0fa29b5e28c.pdf?index=trueIn PDF document text
    • http://kedenutorufet.rf.gd/fejoxejepudatixufonud.pdfIn PDF document text
    • http://tajapog.rf.gd/23395279472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a01d67-2718-46f4-87ce-3c1efc39f380/fijope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70215266-d271-4563-b3e9-33547fad3c31/fallout_4_mods_pc_reddit.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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5112 bytes
SHA-256: 8e71a2b384f0528335ca8b94f58a3f3266c59e2239907fa1a1fb007cb0f601cd
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10840 bytes
SHA-256: 453f090d4463e41b5218a091faa321915a6a94230ebda3e91a593661518259ef

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