Malicious PDF — malware analysis report

Static analysis result for SHA-256 972b47ccdc04b16a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 02:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 075971b522b124b25a9cb62d26d88993 SHA-1: aae09a01765b221cb4e37738bf504b8f76fd3ce4 SHA-256: 972b47ccdc04b16a43a3f50543223c829de021ff3c10f9e8ecc7689fdc8244cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://corpusbg.com/files/fck/file/dasizavadawemiziropu.pdf
    • http://caerulumpharma.com/upload/files/99084092207.pdf
    • http://wo-kop.pl/userfiles/file/gerezewexalekex.pdf
    • http://educasters.co/ckfinder/userfiles/files/9751525554.pdf
    • https://pindimana.in/uploads/file/16640191343.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371536bf5ea---23722468883.pdf
    • http://softtox.com/new/userfiles/file/dapigoko.pdf
    • http://szerecsengyogyszertar.hu/editor_up/nuvaw.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139efef90da1---sagabeduxanatunuvewi.pdf
    • http://lumieye.com/userData/ebizro_board/file/8896143589.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kidimojukezivize.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/varefidofadufili.pdf
    • http://criminisiepartners.it/userfiles/files/rekogogabufelovu.pdf
    • http://habitat3.eu/userfiles/files/wosisakefifavapetuzalo.pdf
    • https://tuinvandecruys.be/file/rosodesozejujekub.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/mipifu.pdf
    • https://bnbcostaverde.it/userfiles/file/87217178967.pdf
    • http://jikaramen.com/uploads/files/41995653363.pdf
    • http://baigeleather.com/userfiles/file/zititogekebisigolelixax.pdf
    • http://piemonteforyou.it/userfiles/file/95722110491.pdf
    • http://hybsch.it/upload/file/51221467505.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mac+chrome+search+shortcut
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 16792 bytes
font_01_sfnt_off0000e729.bin
b0b6dd25cd9cd1f6f652c82fe260cad7d6a66044a80e02798902b72976df40e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10344 bytes
font_02_sfnt_off0000fe99.bin
47221c02ff28fb790f8ad9ba02bbb134f50ebb5f9a79e8b3b95b8246eb651ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 18376 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.