Malicious PDF — malware analysis report

Static analysis result for SHA-256 24314929b9249eb2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 22:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e8652034440e303375e4f42553f8eed7 SHA-1: b68081dd4bc58899475d2740cdde58a54b86c15a SHA-256: 24314929b9249eb2780708d09d26a99c8a055b62b47d1b955c0dfe3fa012680d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://blogsma.com/files/gegopabeletu.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/jizotazurivi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/lupuluxozeta.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xolinito.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/dogavafadixexeb.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/setegewavakutinazup.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/wixiz.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/17807205607.pdfIn PDF document text
    • http://prestopc.it/upload/file/texof.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/15582796474.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/97551353434.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/vixupep.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/rasutipakak.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/61880235412.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/34336073620.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/86892175445.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/99119538484.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/63205005324.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/nurebedowezutekis.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/tidulorelopasumabubep.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/wazukusesoxaso.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/26114721326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=live+tv+channels+android+tvPDF 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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 17376 bytes
SHA-256: 8a9fcecd7f65c77ba3212fdfb08e5f2583af9dd335b5cd77ee7ba1b06d546f94
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 10492 bytes
SHA-256: c02ce398137a31b93316bb4041fe70c960b3cb8b83ff5b31d0a679e073eea42f

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