Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef8bb9b30d04fce…

MALICIOUS

PDF

77.9 KB Created: 2021-03-19 10:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2e291c251d5f1f4412ec32ead7af7741 SHA-1: e3530345a563e258def3707358e6b29ccf50434a SHA-256: fef8bb9b30d04fcecb6d5538d07421595aa07b430efdb3e72aa67d6462bb1518
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=angular+documentation+pdf+download PDF link annotation
    • http://mishabelle.ru/sesapasadvkocj.pdfIn PDF document text
    • http://idealslimitalia-official.site/harry_potter_movies_ranked_by_accuracyk338v.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/db08e2545c.pdfIn PDF document text
    • https://zunenora.weebly.com/uploads/1/3/4/7/134713213/7950fcb2e8e5b2.pdfIn PDF document text
    • http://qqkaxes.xyz/413751157366o0td.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/temedapavoxozevivibuzikcnmuk.pdfIn PDF document text
    • http://karaulovlife.site/princeton_review_mcat_subject_review_complete_box_set_3rd_editionyjevx.pdfIn PDF document text
    • https://milanesove.weebly.com/uploads/1/3/1/3/131383497/jewafajekeru-ginif-dakuwobefa-lilofuvigu.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/3003440.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/42be32fa-df50-40ab-bbba-70ad6d8ec697/fakawotelugeli.pdfIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_cac934aafb4547e8a2d1e501c53b0842.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_bc7ff9613bc4466fa5dac8bcaf718f07.pdf?index=trueIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_8d59f437e82243caba74ad69155a0a42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/10446118993.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/commando_3_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/how_to_get_a_data_science_job_as_a_fresher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96274a2c-096f-4b2b-95c0-f9fb5516505a/autocad_3d_drawings_with_dimensions_for_practice.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_327374c8b4334a899e8b3ece01b1633e.pdf?index=trueIn PDF document text
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_58496a66abcc4b128b753c9e3179a665.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_f13c594ae6bb4c238c551c787b7e9826.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/diagnosis_of_diabetes_canadian_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f13290-104c-414b-9d74-ae05dd172930/63455783399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d1518f-5401-47a6-99d1-4c8a4daf6ceb/gorirefuru.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/kiresinitulenezemesixa.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_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 5380 bytes
SHA-256: 08c3c34aa3f6f03432173325dc411ebda14c3c17430bf2acbe91fd495a2ab55f
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10644 bytes
SHA-256: 9dfb1eb925738ce315d6a76b4003887e94a2660d39e1d776a0bfa48e839dde33