Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38c9541016ea20f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 03:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ad3db1ef6c0cc02a5eb4b1609a09a5d SHA-1: 04c5653632d082906b90fb1c2dd14827e9f4ae9b SHA-256: f38c9541016ea20fd73fd5712dceea07ac57afdf3bfb9ebc68760e5f1c932655
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tysons-cafe.com/uploads/files/88773637204.pdf In PDF document text
    • https://salwangurugram.com/files/babogavobifodokuvofilobup.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/41998339542.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630799564.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/pavopojidubixazabetizu.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/miguj.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/82899052868.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109030202238221.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/zoniwebogoze.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/fowejojovokomirusum.pdfIn PDF document text
    • http://metallpress.info/files/dulajejukix.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/98660636579.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/98183003999.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/simalorinikewag.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/33493374625.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/38576289884.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614654799478c---97041432767.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/zejajatekilalogadorumow.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fd21a4d2c533068c0eab39a002f8c080/rolebodofadoxow.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/18341542197.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/75551996625.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/44116658638.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zedevuvajesun.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/gijet.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/bebinetirikogubexonidolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+download+amazon+app+store+on+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_off0000caef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 10688 bytes
SHA-256: ad9115193996d189ce259f02f6783bf29b65ccaf908d531329745427647704ef
font_01_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 17796 bytes
SHA-256: 93dec4ae0f94ad49d7b0b395b59c3353c6c2890bd3848bc8441b0903b2e72256

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