Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa414b0a09404e1…

MALICIOUS

PDF

80.2 KB Created: 2021-04-01 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4663ae636f51aa8afe62556e25b97db6 SHA-1: e916b7f27c29270eb5227938be328f6b4b5a95d3 SHA-256: 6aa414b0a09404e18e471a4005498c8427859a876857b03269acc7211377096f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack.

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://maypoin.ru/123?utm_term=wrong+turn+7+english+movie+free PDF link annotation
    • http://zibodotuf.mygamesonline.org/johor_bahru_tourist_map.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/fupidenatowudiz.pdfIn PDF document text
    • http://businessoutsourcing.org/spanish_subject_pronouns_worksheet_answer_keyx42qa.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/conjunctions_worksheet_for_grade_5.pdfIn PDF document text
    • http://gelchlen.fun/493793060605269v.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/dbd7b.pdfIn PDF document text
    • http://worldthailand.fun/kerozasi66vzk.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/tivuvonezimegufarupon.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/anita_blake_27.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/alasan_amandemen_uud_1945.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/1770532.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/arihant_ethics_book_download.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/700df5f8-6336-44c5-8730-91015c6da7a8/kisunefaxadoge.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_21c81971d247426ba49d6a02d6da0a1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6aad0d-af23-417b-93be-d9d33f1797ad/7225168520.pdfIn PDF document text
    • http://gekolutewubel.myartsonline.com/cardiologia_pediatrica_diaz_gongora.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_784db58cdaee494d82b00c49b793422e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c63a7fb-06cb-4f4e-a5f8-3d827ebcc029/very_short_stories_in_english_with_moral.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_ce5eed40983c4dc4a30b54abeaa4fa37.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_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 5124 bytes
SHA-256: 0636466fa60568e9665c605ecf4b4faf745af763ddc13312233363d1056b77bd
font_01_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 10564 bytes
SHA-256: e1ee6210fb69ba45b146fbd590442a5e2a0b8b97cf18fb3047ef06f1a6aa825b

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