Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5ba54659fc15ef…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 04:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a29146969f6ac08c0875e6824cb69923 SHA-1: cfc6b2d476dcad2ce4786a0e60c2362ef38adf33 SHA-256: 9c5ba54659fc15ef678b4fadde744d08c0c3f811eeaf10c358272c7d400c79c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rtvpuls.com/ckfinder/userfiles/files/vimafuzesudamewawive.pdf In PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/88224557981.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kirukemevirifudib.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/15449464407.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/bumopu.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/24680876788.pdfIn PDF document text
    • http://tecksco.com/upload/files/48630096918.pdfIn PDF document text
    • http://kalikraft.com/images/file/65664131097.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54769843616.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fesalinokegapowusivupowi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828994d35d---nizoduromu.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/23950013120.pdfIn PDF document text
    • http://domainecomps.com/documents/files/81083635212.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/31923798708.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090201161938.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xarebojobosoga.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/6117696542.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/61913454704.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/43912047058.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/86113980918.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ligeviz.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/fokawezubamipalubido.pdfIn PDF document text
    • https://siroyensao.com/upload/files/6963775872.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/73681730846.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xosekabix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+app+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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 17848 bytes
SHA-256: d4924d981d4a94b582262e88a343bfee2c865bfc56674ad1e26618f0d5c8b792
font_01_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 10048 bytes
SHA-256: 522d04ab334776a45dd22f76c180928dc0f2f8bf493890f9984526fa8a3579c0
font_02_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1