Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40003470a6e09b2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 12:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93d7f33b21ec6c0c711ca21738e4dffd SHA-1: e16aa8867cdb1f544ec6fb1dcc41c5b7ea0cfe5f SHA-256: d40003470a6e09b2c84c54376016ff0ace8f1e7daf14b748c4af62e1e4ba856e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=ios+management+games PDF link annotation
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_13FE956F336A04CC.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sofupufunugurejuz.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/momaliwutesibedeburod.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d3100ee4---wikezavarokalazesodafiz.pdfIn PDF document text
    • http://saaretravel.ee/images/file/supojud.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/37607699067.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/xugazi.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/12739851017.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/64336807842.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e152743c09---3239222010.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/buxasegokor.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/29180550621.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///61613960571.pdfIn PDF document text
    • http://wdnederland.nl/file/lefafadibidakiturononaj.pdfIn PDF document text
    • http://e-hematologica.com/users/file/88706484747.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/womulufosanutinoxul.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/jakeririkejadilaroku.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/9585683665.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/dazisixerepukuwebidanan.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/15918314814.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/sizaforesozib.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/4555598998.pdfIn PDF document text
    • http://autodilygood.cz/files/file/winalikajazixirilodo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mujebud.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 10164 bytes
SHA-256: 9ff40a862bf68238f8d718308bd90968da48918658b33a0adbf070eb300d162b
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 18568 bytes
SHA-256: e1ee01c4bf7605c412508418a547e315a3667f28c28dec870b935b957f78c88b
font_02_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1