Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c7699aab419d5b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 21:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe591c63f915fc6b43a3e8c8aa02a605 SHA-1: 7a85285993b9852b319c7708e061049b309c58a4 SHA-256: b8c7699aab419d5b21541919a4220ae23c46bf79b42b681825b59e5705a4ccd9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'QR-code redirect lure' heuristic further support the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://aprenda-atdi.com/uploads/files/34496454501.pdf In PDF document text
    • http://gyogytornasz.hu/editor_up/doxezolagebugabamividu.pdfIn PDF document text
    • http://caratow.be/userfiles/file/linukir.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614b44edbf3f9.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/26605559516.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/97303880662.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/10897379976.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/95928237856.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/54882968451.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/55868697580.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sunuj.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/33959172961.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/liwoxekalu.pdfIn PDF document text
    • https://ysh.my/userfiles/file/nuruji.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/ridoxogovotuvidalanajuto.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613905df9c4d3---rofutepesazajime.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/monezotepidepokeminimo.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/7450316093.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/1919682785.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/769128cd8896b31fb84f3a0e4f645f68/87609326669.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/48745369210.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/topulejolevufito.pdfIn PDF document text
    • http://hkacca.com/userfiles/14013048304.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/22477016060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+aac+supportPDF 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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 10412 bytes
SHA-256: 9b6fa19b42cbb81a21ac9d70ac66c746735239b2699d061e2172c323494782c4
font_01_sfnt_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 17380 bytes
SHA-256: 62ac6175b72d64ff31e9afcfe2411ac28e09ec5ee5794bb555b248a1f447c9f9
font_02_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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