Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8f8c5dcd8b534…

MALICIOUS

PDF

73.0 KB Created: 2021-09-21 07:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 104f79bbf5fc1f1d164664493249e005 SHA-1: dd7b48c15e5d2eda9ce0e2d4958d93c7b6d574f9 SHA-256: a1a8f8c5dcd8b534dbc8cfea85ee57a4f251865f5bfc9615ac3408114d5b4098
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one specifically flagged as a link farm, suggesting a phishing or redirection attempt. While no scripts were extracted, the presence of multiple URLs pointing to PDF files on various domains indicates a distribution mechanism for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bnbcostaverde.it/userfiles/file/zujevageromotuziniweza.pdf In PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/xadewarego.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/75203836980.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/biliwowokavuviwuwu.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/91619713171.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/40514784435.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/buremodesa.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/xufaxalesamasozekarilogi.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/sorufewasezivajoxojofuzas.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/43246097423.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wimupamipubadu.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/68959718339.pdfIn PDF document text
    • http://erictex.com/ufiles/files/favojapugo.pdfIn PDF document text
    • http://thegioioto.store/upload/files/70804364285.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/saruluwoxuwudirotigobu.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/begeragipupatozopotiri.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/mawifipogibawa.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/58086723677.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/33635400263.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/64187410262.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/33353441363.pdfIn PDF document text
    • http://sksound.com/userfiles/file/zafoxutegiz.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mejoti.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/96483431021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B8%D0%B3%D1%80%D1%83+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+hill+climb+racingPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447b890a1ba---93946133573.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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 11568 bytes
SHA-256: e18ac864215d7e9e6fe2b3cbc1abf459273cb62e629d110ab645430a97b9b43d
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 17848 bytes
SHA-256: 0b656ea2afb0d681eaf24ee1e50ace923bbc359752f1da29febf36b57878969b
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1