Malicious PDF — malware analysis report

Static analysis result for SHA-256 d913689dab38254b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 11:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6465136c9b4f3f3a1c9d6a0e0e7d32f1 SHA-1: d6a5af270da3c25e4c6db75ba1ba261f554a3e85 SHA-256: d913689dab38254b9ec4b1f2cad64bfc5ee6baf0ef8affa99e3e13298c2824d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=mejor+app+para+descargar+peliculas+para+android PDF link annotation
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/61750837616.pdfIn PDF document text
    • https://rjpexport.com/files/ligusamalixuzufewej.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43969228052.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/21543812602.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/jabakimavesuxevobol.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/fimosira.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/38775932926.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/finatesogadogakezamekek.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/minuj.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/januzowifis.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/17341262014.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lazupapinimawikadur.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/bazenozobodiragipow.pdfIn PDF document text
    • http://czyxchem.com/upload/files/wetuloximelogepavitidi.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/63806412806.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210902/files/20210902215107.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/83548908006.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210903224916.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/suketubilanoxigo.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/jeson.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/mijexexitowen.pdfIn PDF document text
    • http://stonebreaker.at/gewar.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/belefolubonajuf.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 20460 bytes
SHA-256: d34a7f53eafa1f0dd673b1634c6d6ddb37df55867e81e22ea786b8e95c3229a5
font_02_sfnt_off000127ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EF 10812 bytes
SHA-256: d4f6cd946a85ae8e0688c23bdbb5b0d6bfdb2214c73b8624e3c0dabcf5bc96cc

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