Malicious PDF — malware analysis report

Static analysis result for SHA-256 a115271010e87a2f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 03:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ccdc783fcc053d46ad6b453a273554a SHA-1: 7741d274d365abf3f1c61ad0aea053d3a3de94ff SHA-256: a115271010e87a2f8d26c298d29f8e3a0a7817a255e94e64ec93917d1d30fefe
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 identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and function as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hoteldanang.vn/uploads/images/files/nalava.pdf In PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/zefiluxagefajunazixogisi.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gesarixenuf.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/jemuzugemonu.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/28420777640.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/78452195088.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/68916347473.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf1461ef2---xivijojajinikikimag.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/60022723785.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/nakowojotexisewivekeji.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/taxiwow.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/popitalovunubawesowedomip.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20808765510.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/25573440222.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/besunonezogufebap.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/85306943005.pdfIn PDF document text
    • http://dsfly.com/uploads/files/piwime.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/mevabofejofegokefesoga.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/86147780271.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/79369123796.pdfIn PDF document text
    • http://www.moyekolodin.com/files/renubasob.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/26163290447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+jegyzetek+vissza%C3%A1ll%C3%ADt%C3%A1saPDF 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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 18332 bytes
SHA-256: 14f6f358eb79c4346cc5012fb181755ac11075b3e454dcfbc807cc06e31f653b
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 11108 bytes
SHA-256: d97f08f74301285524ad0f6aa3b8cdf7855b7698d4cd8b3d4f001519e396758f
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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