Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1f31edce9e3b1e…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 05:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2818035ad2cd78efef9e41f80bd4aefb SHA-1: d57f03516ed5587544172113f27715f97ebe9200 SHA-256: 7a1f31edce9e3b1e566a73c07cf3646d953a6c8a347a7c3f2e1939deed09c977
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains an external URI and an SEO redirector link pointing to 'https://vilenefex.ru/wix?keyword=ball+pectin+freezer+jam', suggesting a lure for users to download something or visit a malicious site. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which can be used to generate PDFs from web content, further supporting the idea that this PDF is a wrapper for a malicious web resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/wix?keyword=ball+pectin+freezer+jam PDF link annotation
    • http://oneitstore.info/entry_level_technical_writing_jobs_austin_txkqk1o.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/block_format_letter.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/rimapaforif.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/conflict_of_romeo_and_julietbq1wa.pdfIn PDF document text
    • http://viwuvomax.iblogger.org/jigefo.pdfIn PDF document text
    • http://legrand-spb.ru/32709962108w7bfc.pdfIn PDF document text
    • http://3203epworthcres.com/management_information_system_practical_examplesnw1so.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/zudetezuzigewe.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/append_file_to_formdata_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/astroworld_trailer_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/17252289115.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/dublin_airport_flight_arrival_information.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/amazon_christmas_crib_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/jarivuzupivisebun.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/85447384872.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/25620202800.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/83253500468.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/android_adb_driver_installer_for_windows.pdfIn PDF document text
    • http://pefogitoveni.epizy.com/holts_paint_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/zapaxelob.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/478610476.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5156 bytes
SHA-256: ce243cdeb9aa9cb0281044336325254af1ad25e66eeb868c8e6efaf73ad89f83
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 10776 bytes
SHA-256: 3d3718db366445e32a4172d9089da9aac4f6f914c0fc9979decb9164f0874594

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