Malicious PDF — malware analysis report

Static analysis result for SHA-256 0776952ddd9d75cc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed123cab28fdbdf4652f084fb2d1a990 SHA-1: 9fcb9e8cbde5a625e04718b60e517091dfdaff14 SHA-256: 0776952ddd9d75cc034f6cfffaf38dd77c339eb62f4eecdce86c4dfbb938c867
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many pointing to potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://vandofigueiredo.com/userfiles/file///22360524085.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/05c4f1c436b77e88a163e4fb176ff0a9/3375640491.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/namozuxeragiwowa.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/14607062981.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/54191782886.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/tolirawexolenuri.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/nizutovaruralibeworu.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/11530058349.pdfIn PDF document text
    • http://linza-market.ru/upload/files/95430664658.pdfIn PDF document text
    • https://blugarden.eu/file/57329526244.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/42968454367.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/janemurasobu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109090924298403.pdfIn PDF document text
    • https://digireg.sk/upload/61838936537.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/38989808615.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/lubobudutosetaniwatapolez.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/12160179791.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c2b95555b252954e6bf7e69fdd37ce94/95629378312.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/gaporinarozolida.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/79762979196.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/82200034762.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/nimatunugobut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=eat+pray+love+pdfPDF 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_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 10292 bytes
SHA-256: 88ceb8bc71c02e70b5b9a024334288f9f20ac9845fceb598ff18dd536f04ee90
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 17772 bytes
SHA-256: 09ca4f8e7243d537befbfe2a67d3edab9f3239b3fa12bf4dfbb3d0284065d7f0
font_02_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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