Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3c582ba1712856…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 11:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb51aebaea92d27fc7a7be748ad4a77e SHA-1: 7ec5eac12a5fd0c821d7d42c6ecc16ec1b333b69 SHA-256: 7f3c582ba17128566adcaabeb050ab05a03acae36154a8b99d5b1f4127611c84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trunghungplastic.com/luutru/files/lapig.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gubisi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/91b10c0d352c0cd91c9b955b4306842b/95635249151.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/vuzegorilulezijaxiwugasoz.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/sozufuni.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/jenowupol.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/18278874701.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/lusizowilitet.pdfIn PDF document text
    • http://gibisch.org/files/files/607008542.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/vujigab.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/wojejowikubukabetuvajuve.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/gegemerebap.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/momigiwuduxupowonapon.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/lubivufo.pdfIn PDF document text
    • http://warehousetraining.ie/images/tonesibubusu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f98656a4b---seruzexobijenobez.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/botevuratuz.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fakimavofo.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/dilofavemutuja.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/24584037263.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/78748790802.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fizibelofemo.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/79328429793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=messages+icon+disappeared+androidPDF 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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16428 bytes
SHA-256: becef72489608fcf3ea7080e2fd964dd9335f856cbe44b844cd006fb71479d98
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 10540 bytes
SHA-256: a3b0c0e0dcb14431d4c30e494d7ea3b9ca4a7a0d52536a8ae1cfe4c7d60e1b24
font_02_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1