Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af1486e06880aa8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 04:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a7ccf917785bcae4014027ece5655d6 SHA-1: a23a393b4040202a3b26181a811f166c46c4b119 SHA-256: 1af1486e06880aa8058373cd8fb4141ff32f6b129fbd8c17ef86e37e135edc5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a link farm heuristic suggests an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kosmonautika.ee/ckfinder/userfiles/files/25987370991.pdf In PDF document text
    • http://dentherapia.hu/files/file/74394558874.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/8276873854.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/41722392964.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/nufesejo.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/zobetefuv.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/nutifuxi.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/nerababitesebegu.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/fedunesoguwemogolerimad.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/ximovu.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/debifulok.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/fuxulegidojezunivefotuju.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/63150987090.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/kolagalo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/5958350275.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/90587823994.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/17967605354.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/55363510870.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/fatogomaxugowaba.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/birapepojufozunas.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/buvenime.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb61be17f5---51417889496.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/12797327539.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/66885192834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=earn+free+robuxPDF 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_off0000bdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF4 16852 bytes
SHA-256: 216b1905e86da8afc46121e2e5bca4d1cecd25d7875de5db9f172c8647bc1e65
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10128 bytes
SHA-256: 2cddc548b473429c5c9935f5b3d5f56d80abae300c421b0976b0f8639914a11b
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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