Malicious PDF — malware analysis report

Static analysis result for SHA-256 818bd5d95260fa8e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 21:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d868ab266c53ac3f8b74e3d31465759 SHA-1: f0332289ae3975fa46fcbb02afced4365254a4cf SHA-256: 818bd5d95260fa8e758746a7ac33373121b02ab2c43eb17408011b20cf07ea7d
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 high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=jack+reacher+never+go+back+720p PDF link annotation
    • https://njshore.drinkpoint.com/uploads/files/ludok.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/5610871935.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/vuwibeledakosese.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/85039140869.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358b76cc896---71533575223.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fezubenidelodukuselaxe.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dezagogoko.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210909_1414BCC590C03605.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/wozewepupevalek.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/demubovopuliwul.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/15304621471.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/40638265131.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zutevoxasizefagisinopebo.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/sines.pdfIn PDF document text
    • https://o-dance.com/upload/files/dopukeg.pdfIn PDF document text
    • http://industrialdevices.in/uploads/bipulukokajupil.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/34796414395.pdfIn PDF document text
    • https://novsport.com/content/File/wusofanubirarizuronegoloj.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/girovolelekogafesoxujug.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/dumutunugogusab.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/nozakotu.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912000314911485.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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 17692 bytes
SHA-256: 48aeb24514af67378468ac230d1985820f7b9f3205d84c8c2450f1bce73d9e2f
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10832 bytes
SHA-256: 08aa1be5d724905042b9d0e12aeb438f283768b4035b5ff626c54bb5c715cdda
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1