Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bee1787a5094ee4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-11 20:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 10775fb44dda91b8c7031eeeaf34a914 SHA-1: 9b6d287321bb9136f84778247201ed300b1b4c3e SHA-256: 3bee1787a5094ee4687712f099c0111e1206713e38c433eb05da8e12f0bd530c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though heavily obfuscated, point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=epub+editor+android PDF link annotation
    • http://szwygs.com/upload/94165454618.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/sogajapepi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312374188332.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/fosaropigawowokovodatawus.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/togeguvi.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210906005724.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/gituramawafavewul.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/64444155956.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sufevibesega.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/72940603165.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae830c842---pudadowatise.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/pedumabojinijogujim.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/66931602218.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/83489568198.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7a3eec6d---25447807156.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/63458122312.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/63518267842.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/61156985743.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/robefosekunirufedoxiwatur.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/3384099212.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/zasanubisiregajakamajipa.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/miwejavufom.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/ravigegejudisu.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://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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 19652 bytes
SHA-256: 9f4722ab6e0e05376202b6473b3b0da05481c056766ceb28fd0ef3084285b3ee
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10396 bytes
SHA-256: 095206d7a267c06e28619df7ce51097da7fc45b519adaf0f91132db2f90eedf7

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