Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50a55a5666d66e3…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 16:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04a7068da0b0b292f6873255b6277300 SHA-1: 7abafe609344a8528c37e19aa7d5ca48010e3893 SHA-256: d50a55a5666d66e3a6ef7243d5e3f71e9b791a7247f2a2be5deb0e64e8670296
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=just+a+breath+away+full+movie+english+subtitles PDF link annotation
    • https://joinvita.com/neu/userfiles/file/lefuputajanasazopimad.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/27707195789.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/3861027297.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/rivinefato.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/66445700921.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/77680602984.pdfIn PDF document text
    • http://caythuocnam.org/images/files/44015838053.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/dereretujo.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/9821268372.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/jurojovapetap.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/75545305096.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pamozowiduluti.pdfIn PDF document text
    • https://reniuved.it/file/47701658808.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/gasitoje.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/54464739017.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9pmmqfu6sgas80r4e0pn2s566p/sowisupo.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/82281917271.pdfIn PDF document text
    • https://wildnaturetravel.com/File/morinonamorerobivuto.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/13195861863.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/93679806175.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zikudonapasabizipisetewip.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb0bc72b3---63541835367.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/xikegavobeber.pdfIn PDF document text
    • http://aromata.ru/upload/files/konadanugogikaz.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 19116 bytes
SHA-256: 62a99d1278baf3e41359457f03e06b142bf1fec64271c37615a99e1d693071ee
font_02_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 11156 bytes
SHA-256: 7f9ad5a866e59d5fcd73a54cc3df172c1cfbaba5f27a8f5b011bdd3c1efb4e78

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