Malicious PDF — malware analysis report

Static analysis result for SHA-256 03992f7a788278e9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 16:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 607a5b23326d5ef1438937ad9aa66c83 SHA-1: c028c9ff3d6e3d731670a7888c8e724b709d3164 SHA-256: 03992f7a788278e9e5b15a9c8899d45586a1a6c73ae78d769067f7689a331a49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm structure point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=star+music+tag+editor+apk+download PDF link annotation
    • http://siripanyalamphun.com/user_img/files/69923908746.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/bipotim.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/76368947703.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jinezotoxodituvetonarij.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/19886669505.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/34714595060.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a2d29b66---3430937285.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/99366278433.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/34073991962.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/80b9164df9b7bcf93e7aa67e99df5f8b/nemajusiveruzuzagevofar.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/99629978459.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/patifole.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/lonirefapunebiboxujeda.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/wuluzilokafegopo.pdfIn PDF document text
    • http://kyea.org/imageuploads/xafewijovikino.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/dedomiweganokadalusu.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/16991148654.pdfIn PDF document text
    • http://talesma.com/E/file/14403702935.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/defoli.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/kudumovuditepaso.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109030248279553.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 11212 bytes
SHA-256: 298094cd331a8d626b25e7c0e944fe407536d7877e2228a686cbb014200e737a
font_01_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 16240 bytes
SHA-256: 2e95edc31ad5bbddf314ff5420d25b3d3a51bc0c90d80c6b4d0f1dc7c64111ef
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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