Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9476e5db1ad71f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 12:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1ee02c64046c9200d8b8b317c0bb495 SHA-1: 8f29cd728a874f23f6bc61d78d19508aae8b9ec5 SHA-256: 2b9476e5db1ad71f2771a1d8f7d347361aca37b0ff7654129ddc21ee04f4b277
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://purefeeling8.com/data/file/63520230202.pdf In PDF document text
    • http://csim.jp/ckeditor/uploads/files/zidafetokisuraxetaximet.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/bapemejejorapulojaw.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/nifipesetuzobepose.pdfIn PDF document text
    • http://khocabien.com/uploads/files/77790309565.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/sg50cfc8snu1t8celiadvqaff6/zawevivavarazomesojexuveb.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/22091955329.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/71418640186.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jasax.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/4825209385.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ae50c8f6---31401713726.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kufikesawokajuw.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/xokixurixeb.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/wefigelitefir.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/30674230740.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/gegazozufiwo.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/gugukakisanovuvajosonineg.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/78439513637.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/9600247612.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/61365702544.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jopoz.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/golusel.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/bibujegovakirizigudazazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=unofficial+iphone+price+in+bdPDF link annotation
    • 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10600 bytes
SHA-256: 0a08474ae7d3f0b9a1d4ed9e7e4f18e369bee3e5db58509e5ad682af760a8869
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 18796 bytes
SHA-256: 099cb4b75039d01de616e864c77a05933a0ec453c4a569908020d4de5340afc8
font_02_sfnt_off0001200c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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