Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44c6953578950d0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 12:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3ccbbe423a9b8700256a1d2d29abe21 SHA-1: 0d12ab98e034fd7f0b40a0b49801d0d1a92964b1 SHA-256: b44c6953578950d0f2543c5efa2feef0f127c18c8771e49a2072aa992548ef69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to distribute traffic to numerous hosts. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=the+children%27s+book+of+virtues+pdf PDF link annotation
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/45682231305.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e340c33b8e---57335017190.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/girogedebigodopewupu.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/7122924165.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/jigupuru.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/garaminixikurififafep.pdfIn PDF document text
    • http://sin-hua.org/userfiles/mimabajakafuwol.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/41205569659.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/semojuritixisemozadodaz.pdfIn PDF document text
    • https://dafelia.com/files/jimaninalaxamalati.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/18835265749.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pogoluroj.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/6182174065.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/zigop.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/88632303433.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/26602606562.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/43088460820.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/gogig.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/31655831365.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/rovofijifiwuxijopetafo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/ganasupadojuziwi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161448330d0ab9---xesusetesaxatipimu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/vonegulixe.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/jibekogekozuko.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/92877094378.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/guren.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_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 17088 bytes
SHA-256: 05445c0ca3aa2a9f12de4f81c545514e99ecb8e88ad25f6b2acdb7e493da15ba
font_02_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10948 bytes
SHA-256: 975ca608d46250187dcb1470850476a57636969a2a9501b201b2ce98a9a70443