Malicious PDF — malware analysis report

Static analysis result for SHA-256 76470802d7381d4d…

MALICIOUS

PDF

72.8 KB Created: 2021-03-18 10:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 34b50d115459977cedda48277434ad4b SHA-1: 1a488030420fdadfe05723bfe4e4bf9f47908060 SHA-256: 76470802d7381d4d477c233b9f9e9391be60a4bcd7ae85695e31a8a78c076855
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is designed to host a large number of links, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=bilangan+real+estimasi+dan+logika+pdf PDF link annotation
    • http://trokot-shtorki.online/comicstaan_abhishek_kumarrfk85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_5fdafd74959a5.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/nouns_lesson_for_grade_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fd2dc82713c0.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_to_work_out_time_taken_in_physics.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/rafopeluxotakixafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_60110ac9f304d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5fe50bc7b1857.pdfIn PDF document text
    • http://thepropheticapp.com/pathfinder_book_listf9b9f.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://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_4542055af1eb448db0af9df8e3e3d312.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b157f925-c46a-4c7e-9392-63644a3a89d6/37163981426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efac3e1-ce8c-48ca-8f01-5be67c4b99d0/wigimesibavifo.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_36ff204d961c45db9b7f8739dad399c4.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_276439df5a3e47cd9047c6b8b200a0fd.pdf?index=trueIn PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_e3f75660036341eaac7d76338ac21791.pdf?index=trueIn PDF document text
    • http://nufagogofuj.epizy.com/45601424014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ee2de5-0d69-4e8b-ad0f-a731b6e8ca35/sokosorezoju.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/can_you_program_xbox_one_remote_to_tv.pdfIn PDF document text
    • http://nexaware.epizy.com/statistical_analysis_of_medical_data_using_sas_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7250640f-0a40-4449-991d-2635c6416b78/percy_jackson_greek_gods_book_series.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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 5264 bytes
SHA-256: 4f5927a6722984bf9e3b33c867f973b0d53c662297545a486d0d9798c4e84c1e
font_01_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 10852 bytes
SHA-256: 52ed1dba4d81005fefc467bb9db2962a29104f85539181fcd6f9ba928351c15d
font_02_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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