Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4b23ae85df3787…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 12:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f983261168ac9b3f83d181e18e4de58c SHA-1: 43e106f7fed059b674b739b67c77277f43711ea7 SHA-256: ee4b23ae85df3787f27cdb76f3000ca9a9b38d62d6d921f8dcfb27c9ef1614fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://nazrabilisim.com/calisma2/files/uploads/ruzeno.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fa5315eee000c350b719ee074042b0e6/24594194713.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/48479370776.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/58797699084.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/25642294798.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/mupefa.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/xudejerutubonudibuj.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/65933679690.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/xirof.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/nezejeru.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/kuvezexebupaxemuwozekodik.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/11776974444.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sobojopufu.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/dagesijupodos.pdfIn PDF document text
    • http://www.bash.cl/media/file/lixukofej.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/nodijazuxifoxaridum.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/fawarimo.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tewuvoxodadikirok.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/98757683131.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/94711903198.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/fafelerexos.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30e7fd7f2a63c647b7a89960979821c1/tixodanidebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pixel+launcher+remove+search+barPDF 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_off0000d2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 18024 bytes
SHA-256: edd0034b6d80d599e0692d71a115bef794440c610cfd6719fed6b9a1c382eb2e
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10808 bytes
SHA-256: 91a87d5e363a408d745ec776fd64cd0932c324a35ad448f8ec45a3c1f66cd45c
font_02_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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