Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4036dd09e25097…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 22:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 232302ecb4855c572fa23520c11275dd SHA-1: 92dcca1878225e253d3784965bb6f04f3a8402e1 SHA-256: 9e4036dd09e250979eef50df6e121553a396f26aa7a0ef842c413ff5a6062cd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, is associated with the wkhtmltopdf tool, often used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0c92337ffc5bc6714017876d83ef88fe/fibuwoniv.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7946e549---32368546383.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/60635112963.pdfIn PDF document text
    • http://skisun.it/userfiles/files/zunudeweredibasezoxadekof.pdfIn PDF document text
    • http://zxsolar.com/d/files/tepusiravijalexora.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/77935282436.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/bevidatagosixidipu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/mumokeludel.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/9851097967.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/darajujuxugovi.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/77429278500.pdfIn PDF document text
    • http://artepcb.com/upload/files/wilewevojofonirofumuk.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/90049556724.pdfIn PDF document text
    • http://sissonne.hu/editor_up/94424324052.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/77341485495.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/17958410638.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/puvabika.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/vodelafejotuledafejefowe.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/13434586734.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/fopasodivukisefujujinaxig.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/jexinekifejile.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-15/20210915190824310319.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/80879619376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=renovation+games+androidPDF 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10656 bytes
SHA-256: f2f53fbb77e15fec2827dbb471433b459b7658e5e288aa89e022ac682aca1f10
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 16976 bytes
SHA-256: 118fc5ad4dc818c36cf9f2276ae55bdb58d85617409620f7d87449a700cd11fe

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