Malicious PDF — malware analysis report

Static analysis result for SHA-256 d067aaac49647334…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 11:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d40fdedcfd1178735ca0a5b10bc636ae SHA-1: 42e4db095204783c887b89064192685637f32aef SHA-256: d067aaac49647334a09e566593db0020b412fa02161fb1ec15d4afea2dc807aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions such as phishing or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gexenareja.pdf In PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/73873448916.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/welixibilutimusoxezobut.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd652969c---nidumavefop.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xawogavar.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/1859536385.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210912213815.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/60179438707.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/metuxumazesoludaxafop.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/29561804961.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/77610654011.pdfIn PDF document text
    • http://geoman.cz/data/file/bakuzesexuze.pdfIn PDF document text
    • http://skupka54.ru/upload/m/mivumeladuwowolibu.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/63307463692.pdfIn PDF document text
    • http://insei.eu/userfiles/files/66418887307.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/31814257001.pdfIn PDF document text
    • https://ms02bet.com/contents/files/15464445588.pdfIn PDF document text
    • http://huefpdf.org/upload/file/83893352110.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/sikiseratukolopanilu.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/57958390790.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/rofepolelazemojiza.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6aa0a1c24---23726423015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+recover+deleted+photos+from+device+storagePDF 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_off0000b8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FF 16136 bytes
SHA-256: cbe6b58c7bb41bcb362f734e3b58d31e84b8398f098f6aa4dd9a87318423f2bd
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 11108 bytes
SHA-256: 3c4242f09168f3fce097ca44e10ea9a76e156877f4fa708e1626c0a674ed49ee
font_02_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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