Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9179b7c68d0596…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 22:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 271723462c05d00bb88355a3e1a589bf SHA-1: b8c9b9f23c9d3380e3a3bdc6d0c6e3305f7cb1fb SHA-256: 8c9179b7c68d05968d29f98d48d10d128fadb2d553532066121c12987650ecd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

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 https://cructi.ru/uplcv?utm_term=cara+backup+rom+android PDF link annotation
    • http://naturalwonders.com/uploads/files/97150529294.pdfIn PDF document text
    • http://airzo.net/userData/board/file/nurarikafobisutagugiroja.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdfIn PDF document text
    • https://bawauang.com/contents/files/nidekoxirimoviminejamexij.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630711527.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/gadominazekutusufejusorit.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/jupit.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/nowetizixeke.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/vaxexifogopovijorekepavo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/96386591121.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/dositavuzu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/mamigiliva.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/rojunaselutudapadage.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/rodexonubotegukabo.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/balanitifugabitavub.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/34506738738.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9b8bda78---1290243904.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/gefabela.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375970cd889---norabaxasagagas.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/nezizalamubof.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/jufajipa.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_off0000b36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36E 10592 bytes
SHA-256: 5977a935b43a1dc15690a5ec1587104112b496307f7b684bb4b6a7c77fa78cb5
font_01_sfnt_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 16012 bytes
SHA-256: 1e02116cfa05ab00b511f9190109e4ea2ea53be2fda62b83cfc6ee5687d13f7c
font_02_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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