Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49f88b9d209462b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-24 00:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 880e3314f505ecca5be1de297ff192b1 SHA-1: b2f8b9b0108bb62632bc0e3da8dbb345b83325c4 SHA-256: c49f88b9d209462b82b8942c737baecd465c130b931fad822fe7324f4c28598d
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. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on potentially disposable domains. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bckvalumni.org/userfiles/file/jipolasi.pdf In PDF document text
    • http://fc-junajted.com/upload/datoteke/budekasalojebabuvuteguwi.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/75090838832.pdfIn PDF document text
    • http://fedime.org/imagenes/82556385336.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/92290752648.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/61028198600.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/64572509273.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210905_000153.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/daxixupasosovujewixido.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/86905725489.pdfIn PDF document text
    • http://speak82.com/_UploadFile/Images/file/lanawiledijexoxokuzupuz.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/92749084578.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/niwaxuwinik.pdfIn PDF document text
    • http://dkind.net/userData/board/file/16550971491.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95620543456.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba3fc43561---27320786824.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/57174350655.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xaburoveledadegem.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/64979174726.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sewupigelupogetewegasul.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/80707815058.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/3605947689.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizavumago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=photoshop+education+freePDF 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_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 18568 bytes
SHA-256: e4c59b14283b96a7e485f2e63b1a1802e87e7cead4209a6de01d32e4ecee6ca3
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 10772 bytes
SHA-256: 24ec64670430d6425fd1430a67509f58a075e4a3a63379e39584e6405767a576